| Transactions |
| Date | Team | Player | Type | OthTm | EffDate | When |
| 3/22/1984 | LA | Bailor | Placed on disabled list | | 3/22/1984 | Before |
| 3/25/1984 | Atl | Harper | Placed on disabled list | | 3/25/1984 | Before |
| 3/25/1984 | Cle | Easterly | Placed on disabled list | | 3/25/1984 | Before |
| 3/25/1984 | Mon | Rogers | Placed on disabled list | | 3/25/1984 | Before |
| 3/26/1984 | Mon | Breining | Placed on disabled list | | 3/26/1984 | Before |
| 3/26/1984 | NYN | Gibbons | Placed on disabled list | | 3/26/1984 | Before |
| 3/26/1984 | NYN | Stearns | Placed on disabled list | | 3/26/1984 | Before |
| 3/27/1984 | Cal | Aase | Placed on disabled list | | 3/27/1984 | Before |
| 3/27/1984 | Cal | Zahn | Placed on disabled list | | 3/27/1984 | Before |
| 3/27/1984 | ChN | Reuschel | Placed on disabled list | | 3/27/1984 | Before |
| 3/27/1984 | NYA | Armstrong | Placed on disabled list | | 3/27/1984 | Before |
| 3/28/1984 | Atl | Forster | Placed on disabled list | | 3/28/1984 | Before |
| 3/28/1984 | Cin | Owchinko | Placed on disabled list | | 3/28/1984 | Before |
| 3/28/1984 | Cle | Bando | Placed on disabled list | | 3/28/1984 | Before |
| 3/28/1984 | KC | Jones,L | Placed on disabled list | | 3/28/1984 | Before |
| 3/28/1984 | KC | Washington | Placed on disabled list | | 3/28/1984 | Before |
| 3/29/1984 | Cal | Burleson | Placed on disabled list | | 3/29/1984 | Before |
| 3/29/1984 | Cal | Kison | Placed on disabled list | | 3/29/1984 | Before |
| 3/29/1984 | Hou | Bass | Placed on disabled list | | 3/29/1984 | Before |
| 3/29/1984 | Mil | Clark | Placed on disabled list | | 3/29/1984 | Before |
| 3/29/1984 | Min | Castillo | Placed on disabled list | | 3/29/1984 | Before |
| 3/29/1984 | Min | Schrom | Placed on disabled list | | 3/29/1984 | Before |
| 3/29/1984 | Sea | Coles | Placed on disabled list | | 3/29/1984 | Before |
| 3/31/1984 | Atl | Johnson | Placed on disabled list | | 3/31/1984 | Before |
| 3/31/1984 | Oak | Langford | Placed on disabled list | | 3/31/1984 | Before |
| 4/1/1984 | ChN | Brusstar | Placed on disabled list | | 4/1/1984 | Before |
| 4/1/1984 | KC | Brett | Placed on disabled list | | 4/1/1984 | Before |
| 4/2/1984 | Hou | Sambito | Placed on disabled list | | 4/2/1984 | Before |
| 4/2/1984 | Mil | Waits | Placed on disabled list | | 4/2/1984 | Before |
| 4/2/1984 | SF | Hammaker | Placed on disabled list | | 4/2/1984 | Before |
| 4/4/1984 | NYA | Kemp | Placed on disabled list | | 4/4/1984 | Before |
| 4/7/1984 | NYA | Meacham | Demoted to reserve roster | | | Before |
| 4/7/1984 | NYA | Smith | Promoted to active roster | | | Before |
| 4/7/1984 | Pit | Green | Promoted to active roster | | | Before |
| 4/7/1984 | Pit | Scurry | Placed on disabled list | | 4/7/1984 | Before |
| 4/7/1984 | Sea | Davis | Promoted to active roster | | | Before |
| 4/7/1984 | Sea | Phelps | Placed on disabled list | | 4/7/1984 | Before |
| 4/9/1984 | Hou | Thon | Placed on disabled list | | 4/9/1984 | Before |
| 4/9/1984 | Hou | Tolman | Promoted to active roster | | | Before |
| 4/10/1984 | Det | Jones | Signed | | | Before |
| 4/10/1984 | Det | Jones | Demoted to reserve roster | | | Before |
| 4/10/1984 | NYN | Gaff | Demoted to reserve roster | | | Before |
| 4/10/1984 | NYN | Gibbons | Activated from disabled list | | | Before |
| 4/11/1984 | Cal | Forsch | Placed on disabled list | | 4/11/1984 | Before |
| 4/11/1984 | Cal | Zahn | Activated from disabled list | | | Before |
| 4/11/1984 | SF | Baker | Promoted to active roster | | | Before |
| 4/11/1984 | SF | Wellman | Demoted to reserve roster | | | Before |
| 4/12/1984 | Cal | Sconiers | Placed on disabled list | | 4/12/1984 | Before |
| 4/12/1984 | ChN | Johnstone | Placed on disabled list | | 4/12/1984 | Before |
| 4/12/1984 | KC | Washington | Activated from disabled list | | | Before |
| 4/12/1984 | KC | Wills | Demoted to reserve roster | | | Before |
| 4/12/1984 | Pit | Harper | Placed on disabled list | | 4/12/1984 | Before |
| 4/12/1984 | Pit | Orsulak | Promoted to active roster | | | Before |
| 4/13/1984 | Cal | Corbett | Promoted to active roster | | | Before |
| 4/13/1984 | Hou | Bass | Activated from disabled list | | | Before |
| 4/13/1984 | Hou | Puhl | Placed on disabled list | | 4/13/1984 | Before |
| 4/16/1984 | Bal | Ford | Placed on disabled list | | 4/16/1984 | Before |
| 4/16/1984 | ChN | Brusstar | Activated from disabled list | | | Before |
| 4/16/1984 | NYA | Gamble | Signed | | | Before |
| 4/16/1984 | NYA | Robertson | Promoted to active roster | | | Before |
| 4/16/1984 | NYA | Smith | Demoted to reserve roster | | | Before |
| 4/16/1984 | NYA | Winfield | Placed on disabled list | | 4/16/1984 | Before |
| 4/18/1984 | Cin | Owchinko | Activated from disabled list | | | Before |
| 4/18/1984 | Cin | Scherrer | Placed on disabled list | | 4/18/1984 | Before |
| 4/19/1984 | Atl | Forster | Activated from disabled list | | | Before |
| 4/19/1984 | Atl | Moore | Placed on disabled list | | 4/19/1984 | Before |
| 4/19/1984 | Bal | Rayford | Promoted to active roster | | | Before |
| 4/19/1984 | Mon | Rogers | Activated from disabled list | | | Before |
| 4/19/1984 | Mon | Stenhouse | Demoted to reserve roster | | | Before |
| 4/19/1984 | StL | Lyons | Demoted to reserve roster | | | Before |
| 4/19/1984 | StL | Stuper | Promoted to active roster | | | Before |
| 4/20/1984 | Cle | Bando | Activated from disabled list | | | Before |
| 4/20/1984 | Cle | Bando | Demoted to reserve roster | | | Before |
| 4/20/1984 | Mil | Augustine | Demoted to reserve roster | | | Before |
| 4/20/1984 | Mil | Waits | Activated from disabled list | | | Before |
| 4/20/1984 | Mon | Breining | Activated from disabled list | | | Before |
| 4/20/1984 | Mon | Gullickson | Placed on disabled list | | 4/20/1984 | Before |
| 4/20/1984 | NYA | Kemp | Activated from disabled list | | | Before |
| 4/21/1984 | Atl | Johnson | Activated from disabled list | | | Before |
| 4/21/1984 | Atl | Runge | Demoted to reserve roster | | | Before |
| 4/21/1984 | ChN | Altamirano | Demoted to reserve roster | | | Before |
| 4/21/1984 | ChN | Reuschel | Activated from disabled list | | | Before |
| 4/24/1984 | Atl | Harper | Activated from disabled list | | | Before |
| 4/24/1984 | Atl | Pocoroba | Released | | | Before |
| 4/24/1984 | Atl | Sinatro | Demoted to reserve roster | | | Before |
| 4/24/1984 | Atl | Trevino | Acquired via trade | Cin | | Before |
| 4/24/1984 | Cin | Franco | Promoted to active roster | | | Before |
| 4/24/1984 | Cin | Smith | Demoted to reserve roster | | | Before |
| 4/24/1984 | Cin | Trevino | Traded away | Atl | | Before |
| 4/24/1984 | Sea | Coles | Activated from disabled list | | | Before |
| 4/24/1984 | Sea | Nelson | Demoted to reserve roster | | | Before |
| 4/25/1984 | Cin | Lesley | Promoted to active roster | | | Before |
| 4/25/1984 | Hou | Ashby | Placed on disabled list | | 4/25/1984 | Before |
| 4/25/1984 | Min | Comstock | Demoted to reserve roster | | | Before |
| 4/25/1984 | Min | Whitehouse | Promoted to active roster | | | Before |
| 4/26/1984 | ChA | Fallon | Promoted to active roster | | | Before |
| 4/26/1984 | ChA | Hulett | Demoted to reserve roster | | | Before |
| 4/26/1984 | Hou | Bailey | Promoted to active roster | | | Before |
| 4/26/1984 | Min | Eisenreich | Placed on disabled list | | 4/26/1984 | Before |
| 4/26/1984 | Min | Hodge | Promoted to active roster | | | Before |
| 4/26/1984 | SF | Grant | Promoted to active roster | | | Before |
| 4/26/1984 | SF | Pittman | Demoted to reserve roster | | | Before |
| 4/26/1984 | Tex | Henke | Demoted to reserve roster | | | Before |
| 4/26/1984 | Tex | Wright,R | Promoted to active roster | | | Before |
| 4/27/1984 | LA | Landreaux | Placed on disabled list | | 4/27/1984 | Before |
| 4/27/1984 | LA | Stubbs | Promoted to active roster | | | Before |
| 4/28/1984 | Atl | Horner | Placed on disabled list | | 4/28/1984 | Before |
| 4/28/1984 | Atl | Runge | Promoted to active roster | | | Before |
| 4/28/1984 | Phi | Diaz | Placed on disabled list | | 4/28/1984 | Before |
| 4/29/1984 | Bos | Stapleton | Placed on disabled list | | 4/29/1984 | Before |
| 4/29/1984 | ChA | Brennan | Demoted to reserve roster | | | Before |
| 4/29/1984 | ChA | Jones | Promoted to active roster | | | Before |
| 4/29/1984 | NYA | Brown | Promoted to active roster | | | Before |
| 4/29/1984 | NYA | Montefusco | Placed on disabled list | | 4/29/1984 | Before |
| 4/30/1984 | Cin | Householder | Demoted to reserve roster | | | Before |
| 4/30/1984 | Cin | Krenchicki | Promoted to active roster | | | Before |
| 4/30/1984 | Hou | Puhl | Activated from disabled list | | | Before |
| 4/30/1984 | Hou | Tolman | Demoted to reserve roster | | | Before |
| 5/1/1984 | Atl | Dayley | Demoted to reserve roster | | | Before |
| 5/1/1984 | Atl | Perez | Promoted to active roster | | | Before |
| 5/1/1984 | NYA | Javier | Demoted to reserve roster | | | Before |
| 5/1/1984 | NYA | Winfield | Activated from disabled list | | | Before |
| 5/1/1984 | Phi | Bystrom | Promoted to active roster | | | Before |
| 5/2/1984 | Hou | Tolman | Promoted to active roster | | | Before |
| 5/2/1984 | Hou | Walling | Placed on disabled list | | 5/2/1984 | Before |
| 5/2/1984 | KC | Biancalana | Demoted to reserve roster | | | Before |
| 5/2/1984 | KC | Jones,L | Activated from disabled list | | | Before |
| 5/2/1984 | Mil | Clark | Activated from disabled list | | | Before |
| 5/2/1984 | Mil | Molitor | Placed on disabled list | | 5/2/1984 | Before |
| 5/2/1984 | NYN | Chapman | Promoted to active roster | | | Before |
| 5/2/1984 | NYN | Gibbons | Placed on disabled list | | 5/2/1984 | Before |
| 5/2/1984 | StL | Hassler | Signed | | | Before |
| 5/2/1984 | StL | Hassler | Demoted to reserve roster | | | Before |
| 5/3/1984 | Cal | Brown,M | Promoted to active roster | | | Before |
| 5/3/1984 | Cal | Brown,S | Demoted to reserve roster | | | Before |
| 5/3/1984 | Cin | Lesley | Demoted to reserve roster | | | Before |
| 5/3/1984 | Cin | Scherrer | Activated from disabled list | | | Before |
| 5/3/1984 | Oak | Hill | Placed on disabled list | | 5/3/1984 | Before |
| 5/3/1984 | Oak | Wagner | Promoted to active roster | | | Before |
| 5/4/1984 | SF | Garrelts | Promoted to active roster | | | Before |
| 5/4/1984 | SF | Grant | Placed on disabled list | | 5/4/1984 | Before |
| 5/5/1984 | Min | Faedo | Demoted to reserve roster | | | Before |
| 5/5/1984 | Min | Hart | Promoted to active roster | | | Before |
| 5/5/1984 | Tex | Richardt | Promoted to active roster | | | Before |
| 5/5/1984 | Tex | Stein | Placed on disabled list | | 5/5/1984 | Before |
| 5/6/1984 | Bos | Boyd | Demoted to reserve roster | | | Before |
| 5/6/1984 | Bos | Crawford | Promoted to active roster | | | Before |
| 5/6/1984 | LA | Scioscia | Placed on disabled list | | 5/6/1984 | Before |
| 5/6/1984 | SD | Chiffer | Promoted to active roster | | | Before |
| 5/6/1984 | SD | DeLeon | Placed on disabled list | | 5/6/1984 | Before |
| 5/7/1984 | Bal | Nolan | Placed on disabled list | | 5/7/1984 | Before |
| 5/7/1984 | Bal | Young | Promoted to active roster | | | Before |
| 5/7/1984 | LA | Fimple | Promoted to active roster | | | Before |
| 5/7/1984 | Min | Puckett | Promoted to active roster | | | Before |
| 5/7/1984 | Min | Reed | Demoted to reserve roster | | | Before |
| 5/7/1984 | Mon | Breining | Placed on disabled list | | 5/7/1984 | Before |
| 5/7/1984 | NYA | Cerone | Placed on disabled list | | 5/7/1984 | Before |
| 5/7/1984 | NYA | O'Berry | Promoted to active roster | | | Before |
| 5/8/1984 | LA | Bailor | Activated from disabled list | | | Before |
| 5/8/1984 | LA | Rivera | Demoted to reserve roster | | | Before |
| 5/8/1984 | Mon | Gullickson | Activated from disabled list | | | Before |
| 5/8/1984 | NYN | Gaff | Promoted to active roster | | | Before |
| 5/8/1984 | NYN | Tidrow | Released | | | Before |
| 5/8/1984 | Tor | Leach | Promoted to active roster | | | Before |
| 5/8/1984 | Tor | Petralli | Demoted to reserve roster | | | Before |
| 5/9/1984 | ChA | Fallon | Demoted to reserve roster | | | Before |
| 5/9/1984 | ChA | Siwy | Promoted to active roster | | | Before |
| 5/9/1984 | KC | Davis | Demoted to reserve roster | | | Before |
| 5/9/1984 | KC | Iorg | Acquired via trade | StL | | Before |
| 5/9/1984 | NYN | Gorman | Promoted to active roster | | | Before |
| 5/9/1984 | NYN | Swan | Released | | | Before |
| 5/9/1984 | Oak | Bettendorf | Released | | | Before |
| 5/9/1984 | Oak | Krueger | Promoted to active roster | | | Before |
| 5/9/1984 | StL | Iorg | Traded away | KC | | Before |
| 5/10/1984 | NYA | Christiansen | Promoted to active roster | | | Before |
| 5/10/1984 | NYA | Murray | Placed on disabled list | | 5/10/1984 | Before |
| 5/10/1984 | Pit | Green | Demoted to reserve roster | | | Before |
| 5/10/1984 | Pit | Harper | Activated from disabled list | | | Before |
| 5/10/1984 | StL | Nieto | Promoted to active roster | | | Before |
| 5/10/1984 | Tex | Bell | Suspended | | | Before |
| 5/11/1984 | Bos | Clemens | Promoted to active roster | | | Before |
| 5/11/1984 | Cle | Bernazard | Suspended | | | Before |
| 5/12/1984 | LA | Brock | Placed on disabled list | | 5/12/1984 | Before |
| 5/12/1984 | LA | Landreaux | Activated from disabled list | | | Before |
| 5/12/1984 | Tex | Bell | Reinstated | | | Before |
| 5/13/1984 | ChA | Boston | Promoted to active roster | | | Before |
| 5/13/1984 | ChA | Siwy | Demoted to reserve roster | | | Before |
| 5/13/1984 | LA | Marshall | Placed on disabled list | | 5/13/1984 | Before |
| 5/13/1984 | LA | Reynolds | Promoted to active roster | | | Before |
| 5/13/1984 | Pit | Orsulak | Demoted to reserve roster | | | Before |
| 5/13/1984 | Pit | Scurry | Activated from disabled list | | | Before |
| 5/13/1984 | SF | Mullins | Placed on disabled list | | 5/13/1984 | Before |
| 5/13/1984 | SF | O'Malley | Promoted to active roster | | | Before |
| 5/13/1984 | SF | Pittman | Promoted to active roster | | | Before |
| 5/13/1984 | SF | Trillo | Placed on disabled list | | 5/13/1984 | Before |
| 5/13/1984 | Tor | Clark | Promoted to active roster | | | Before |
| 5/13/1984 | Tor | McLaughlin | Released | | | Before |
| 5/14/1984 | ChN | Lake | Placed on disabled list | | 5/14/1984 | Before |
| 5/14/1984 | Cle | Bernazard | Reinstated | | | Before |
| 5/14/1984 | LA | Miller | Promoted to active roster | | | Before |
| 5/14/1984 | LA | Russell | Placed on disabled list | | 5/14/1984 | Before |
| 5/14/1984 | Min | Castino | Placed on disabled list | | 5/14/1984 | Before |
| 5/15/1984 | ChN | Johnstone | Activated from disabled list | | | Before |
| 5/15/1984 | Cle | Behenna | Demoted to reserve roster | | | Before |
| 5/15/1984 | Cle | Farr | Promoted to active roster | | | Before |
| 5/15/1984 | SD | Salazar | Placed on disabled list | | 5/15/1984 | Before |
| 5/16/1984 | Bal | Sanchez | Acquired via trade | KC | | Before |
| 5/16/1984 | Bal | Singleton | Placed on disabled list | | 5/16/1984 | Before |
| 5/16/1984 | KC | Sanchez | Traded away | Bal | | Before |
| 5/16/1984 | KC | Wilson | Promoted to active roster | | | Before |
| 5/16/1984 | NYN | Jones | Demoted to reserve roster | | | Before |
| 5/16/1984 | NYN | Martin | Promoted to active roster | | | Before |
| 5/16/1984 | Pit | Distefano | Promoted to active roster | | | Before |
| 5/16/1984 | Pit | Harper | Placed on disabled list | | 5/16/1984 | Before |
| 5/16/1984 | Sea | Thomas,G | Placed on disabled list | | 5/16/1984 | Before |
| 5/16/1984 | Tor | Aikens | Promoted to active roster | | | Before |
| 5/16/1984 | Tor | Gruber | Demoted to reserve roster | | | Before |
| 5/17/1984 | Atl | Horner | Activated from disabled list | | | Before |
| 5/17/1984 | Atl | Runge | Demoted to reserve roster | | | Before |
| 5/17/1984 | Bal | Palmer | Released | | | Before |
| 5/17/1984 | Bal | Swaggerty | Promoted to active roster | | | Before |
| 5/17/1984 | Min | Williams | Placed on disabled list | | 5/17/1984 | Before |
| 5/18/1984 | ChN | Owen | Promoted to active roster | | | Before |
| 5/18/1984 | ChN | Veryzer | Placed on disabled list | | 5/18/1984 | Before |
| 5/18/1984 | Cin | Davis | Promoted to active roster | | | Before |
| 5/18/1984 | Cin | Walker | Placed on disabled list | | 5/18/1984 | Before |
| 5/18/1984 | KC | Ashford | Demoted to reserve roster | | | Before |
| 5/18/1984 | KC | Brett | Activated from disabled list | | | Before |
| 5/18/1984 | Min | Eisenreich | Activated from disabled list | | | Before |
| 5/18/1984 | Oak | Hill | Activated from disabled list | | | Before |
| 5/18/1984 | Oak | Hill | Demoted to reserve roster | | | Before |
| 5/18/1984 | SD | Bochy | Promoted to active roster | | | Before |
| 5/18/1984 | SD | Booker | Promoted to active roster | | | Before |
| 5/18/1984 | SD | Gwosdz | Demoted to reserve roster | | | Before |
| 5/18/1984 | Sea | Phelps | Activated from disabled list | | | Before |
| 5/19/1984 | Bos | Remy | Placed on disabled list | | 5/19/1984 | Before |
| 5/19/1984 | KC | Ashford | Released | | | Before |
| 5/19/1984 | Pit | Otis | Placed on disabled list | | 5/19/1984 | Before |
| 5/19/1984 | Pit | Wotus | Promoted to active roster | | | Before |
| 5/20/1984 | ChN | Altamirano | Promoted to active roster | | | Before |
| 5/20/1984 | ChN | Ruthven | Placed on disabled list | | 5/20/1984 | Before |
| 5/20/1984 | Mil | Tellmann | Placed on disabled list | | 5/20/1984 | Before |
| 5/20/1984 | NYA | Rasmussen | Promoted to active roster | | | Before |
| 5/20/1984 | NYA | Rawley | Placed on disabled list | | 5/20/1984 | Before |
| 5/20/1984 | Oak | Burgmeier | Placed on disabled list | | 5/20/1984 | Before |
| 5/21/1984 | Bos | Walker | Promoted to active roster | | | Before |
| 5/21/1984 | Cal | Curtis | Placed on disabled list | | 5/21/1984 | Before |
| 5/21/1984 | LA | Fimple | Demoted to reserve roster | | | Before |
| 5/21/1984 | LA | Scioscia | Activated from disabled list | | | Before |
| 5/21/1984 | Mil | Gibson | Promoted to active roster | | | Before |
| 5/21/1984 | Tor | Fernandez | Promoted to active roster | | | Before |
| 5/21/1984 | Tor | Webster | Demoted to reserve roster | | | Before |
| 5/22/1984 | Min | Schrom | Activated from disabled list | | | Before |
| 5/22/1984 | Mon | Salazar | Demoted to reserve roster | | | Before |
| 5/22/1984 | Mon | Stenhouse | Promoted to active roster | | | Before |
| 5/23/1984 | Cal | Swan | Signed | | | Before |
| 5/23/1984 | ChA | Boston | Demoted to reserve roster | | | Before |
| 5/23/1984 | ChA | Quirk | Signed | | | Before |
| 5/23/1984 | ChA | Quirk | Demoted to reserve roster | | | Before |
| 5/23/1984 | ChA | Skinner | Promoted to active roster | | | Before |
| 5/23/1984 | Cle | Blyleven | Placed on disabled list | | 5/23/1984 | Before |
| 5/23/1984 | Cle | Comer | Promoted to active roster | | | Before |
| 5/23/1984 | SF | Grant | Activated from disabled list | | | Before |
| 5/23/1984 | SF | Lerch | Placed on disabled list | | 5/23/1984 | Before |
| 5/24/1984 | Atl | Harper | Demoted to reserve roster | | | Before |
| 5/24/1984 | Atl | Moore | Activated from disabled list | | | Before |
| 5/24/1984 | Hou | Madden | Demoted to reserve roster | | | Before |
| 5/24/1984 | Hou | Pankovitz | Promoted to active roster | | | Before |
| 5/24/1984 | Hou | Tolman | Demoted to reserve roster | | | Before |
| 5/24/1984 | Hou | Walling | Activated from disabled list | | | Before |
| 5/24/1984 | Oak | Jones | Promoted to active roster | | | Before |
| 5/24/1984 | StL | Green | Placed on disabled list | | 5/24/1984 | Before |
| 5/24/1984 | StL | Lyons | Promoted to active roster | | | Before |
| 5/24/1984 | StL | Nieto | Demoted to reserve roster | | | Before |
| 5/24/1984 | StL | Rajsich | Promoted to active roster | | | Before |
| 5/25/1984 | Atl | Camp | Placed on disabled list | | 5/25/1984 | Before |
| 5/25/1984 | Atl | Harper | Promoted to active roster | | | Before |
| 5/25/1984 | Bos | Buckner | Acquired via trade | ChN | | Before |
| 5/25/1984 | Bos | Eckersley | Traded away | ChN | | Before |
| 5/25/1984 | ChN | Buckner | Traded away | Bos | | Before |
| 5/25/1984 | ChN | Eckersley | Acquired via trade | Bos | | Before |
| 5/25/1984 | Hou | Bannister | Traded away | Tex | | Before |
| 5/25/1984 | Hou | Richardt | Acquired via trade | Tex | | Before |
| 5/25/1984 | Hou | Richardt | Demoted to reserve roster | | | Before |
| 5/25/1984 | Hou | Sambito | Activated from disabled list | | | Before |
| 5/25/1984 | Tex | Bannister | Acquired via trade | Hou | | Before |
| 5/25/1984 | Tex | Richardt | Traded away | Hou | | Before |
| 5/26/1984 | ChN | Altamirano | Demoted to reserve roster | | | Before |
| 5/26/1984 | ChN | Schulze | Promoted to active roster | | | Before |
| 5/27/1984 | ChN | Altamirano | Promoted to active roster | | | Before |
| 5/27/1984 | ChN | Schulze | Demoted to reserve roster | | | Before |
| 5/28/1984 | ChA | Barojas | Demoted to reserve roster | | | Before |
| 5/28/1984 | ChA | Roberge | Promoted to active roster | | | Before |
| 5/28/1984 | Pit | Orsulak | Promoted to active roster | | | Before |
| 5/28/1984 | Pit | Wotus | Demoted to reserve roster | | | Before |
| 5/28/1984 | Sea | Mercado | Demoted to reserve roster | | | Before |
| 5/28/1984 | Sea | Nahorodny | Promoted to active roster | | | Before |
| 5/30/1984 | Atl | Komminsk | Promoted to active roster | | | Before |
| 5/30/1984 | Atl | Washington | Placed on disabled list | | 5/30/1984 | Before |
| 5/30/1984 | Bos | Boyd | Promoted to active roster | | | Before |
| 5/30/1984 | Bos | Brown | Demoted to reserve roster | | | Before |
| 5/30/1984 | Cin | Cedeno | Placed on disabled list | | 5/30/1984 | Before |
| 5/30/1984 | KC | Huismann | Demoted to reserve roster | | | Before |
| 5/30/1984 | KC | Leibrandt | Promoted to active roster | | | Before |
| 5/31/1984 | Cin | Soto | Suspended | | | Before |
| 5/31/1984 | Hou | Ashby | Activated from disabled list | | | Before |
| 5/31/1984 | Hou | Wieghaus | Demoted to reserve roster | | | Before |
| 5/31/1984 | Phi | Denny | Placed on disabled list | | 5/31/1984 | Before |
| 5/31/1984 | Phi | Diaz | Activated from disabled list | | | Before |
| 6/1/1984 | Bal | Sanchez | Demoted to reserve roster | | | Before |
| 6/1/1984 | Bal | Singleton | Activated from disabled list | | | Before |
| 6/1/1984 | ChN | Meridith | Promoted to active roster | | | Before |
| 6/1/1984 | ChN | Sanderson | Placed on disabled list | | 6/1/1984 | Before |
| 6/1/1984 | SF | Cornell | Promoted to active roster | | | Before |
| 6/1/1984 | SF | Martin | Demoted to reserve roster | | | Before |
| 6/1/1984 | SF | Mullins | Activated from disabled list | | | Before |
| 6/1/1984 | SF | O'Malley | Demoted to reserve roster | | | Before |
| 6/1/1984 | SF | Pittman | Demoted to reserve roster | | | Before |
| 6/1/1984 | SF | Wellman | Promoted to active roster | | | Before |
| 6/1/1984 | StL | Forsch | Placed on disabled list | | 6/1/1984 | Before |
| 6/1/1984 | StL | Von Ohlen | Promoted to active roster | | | Before |
| 6/1/1984 | Tex | Bibby | Released | | | Before |
| 6/1/1984 | Tex | McLaughlin | Signed | | | Before |
| 6/1/1984 | Tex | Scott | Promoted to active roster | | | Before |
| 6/1/1984 | Tex | Wright,R | Demoted to reserve roster | | | Before |
| 6/2/1984 | Hou | Madden | Promoted to active roster | | | Before |
| 6/2/1984 | Hou | Ryan | Placed on disabled list | | 6/2/1984 | Before |
| 6/2/1984 | Phi | McGraw | Placed on disabled list | | 6/2/1984 | Before |
| 6/2/1984 | Phi | Wehrmeister | Promoted to active roster | | | Before |
| 6/3/1984 | Cin | Walker | Activated from disabled list | | | Before |
| 6/3/1984 | LA | Marshall | Activated from disabled list | | | Before |
| 6/3/1984 | LA | Miller | Demoted to reserve roster | | | Before |
| 6/3/1984 | Mil | Porter | Placed on disabled list | | 6/3/1984 | Before |
| 6/3/1984 | Phi | Aguayo | Demoted to reserve roster | | | Before |
| 6/3/1984 | Phi | Kern | Signed | | | Before |
| 6/4/1984 | Atl | Horner | Placed on disabled list | | 6/4/1984 | Before |
| 6/4/1984 | Atl | Runge | Promoted to active roster | | | Before |
| 6/4/1984 | Cin | Cato | Promoted to active roster | | | Before |
| 6/4/1984 | Cin | Davis | Demoted to reserve roster | | | Before |
| 6/4/1984 | LA | Landestoy | Demoted to reserve roster | | | Before |
| 6/4/1984 | LA | Russell | Activated from disabled list | | | Before |
| 6/4/1984 | Mil | Caldwell | Placed on disabled list | | 6/4/1984 | Before |
| 6/4/1984 | Mil | Lazorko | Promoted to active roster | | | Before |
| 6/4/1984 | Min | Eisenreich | Released | | | Before |
| 6/4/1984 | NYA | Brown | Demoted to reserve roster | | | Before |
| 6/4/1984 | NYA | Rawley | Activated from disabled list | | | Before |
| 6/4/1984 | NYN | Gibbons | Activated from disabled list | | | Before |
| 6/4/1984 | NYN | Gibbons | Demoted to reserve roster | | | Before |
| 6/4/1984 | Pit | Harper | Activated from disabled list | | | Before |
| 6/4/1984 | Pit | Orsulak | Demoted to reserve roster | | | Before |
| 6/5/1984 | Cin | Soto | Reinstated | | | Before |
| 6/6/1984 | Cal | Kison | Activated from disabled list | | | Before |
| 6/6/1984 | Cal | Swan | Placed on disabled list | | 6/6/1984 | Before |
| 6/6/1984 | Det | Allen | Demoted to reserve roster | | | Before |
| 6/6/1984 | Det | Jones | Promoted to active roster | | | Before |
| 6/6/1984 | KC | Davis | Promoted to active roster | | | Before |
| 6/6/1984 | KC | Jones,L | Placed on disabled list | | 6/6/1984 | Before |
| 6/6/1984 | Mon | Harris | Demoted to reserve roster | | | Before |
| 6/6/1984 | Mon | Johnson,Ron | Promoted to active roster | | | Before |
| 6/7/1984 | Det | Lowry | Demoted to reserve roster | | | Before |
| 6/7/1984 | Det | Willis | Promoted to active roster | | | Before |
| 6/7/1984 | LA | Brock | Activated from disabled list | | | Before |
| 6/7/1984 | LA | Morales | Released | | | Before |
| 6/7/1984 | SF | Grant | Demoted to reserve roster | | | Before |
| 6/7/1984 | SF | Lerch | Activated from disabled list | | | Before |
| 6/8/1984 | Bos | Gale | Promoted to active roster | | | Before |
| 6/8/1984 | Bos | Walker | Demoted to reserve roster | | | Before |
| 6/8/1984 | ChA | Barojas | Promoted to active roster | | | Before |
| 6/8/1984 | ChA | Reed | Placed on disabled list | | 6/8/1984 | Before |
| 6/8/1984 | LA | Reuss | Placed on disabled list | | 6/8/1984 | Before |
| 6/8/1984 | LA | Rodas | Promoted to active roster | | | Before |
| 6/8/1984 | Min | Williams | Activated from disabled list | | | Before |
| 6/9/1984 | Atl | Camp | Activated from disabled list | | | Before |
| 6/9/1984 | Atl | Dedmon | Demoted to reserve roster | | | Before |
| 6/9/1984 | Phi | Aguayo | Promoted to active roster | | | Before |
| 6/9/1984 | Phi | Matuszek | Placed on disabled list | | 6/9/1984 | Before |
| 6/10/1984 | Cle | Blyleven | Activated from disabled list | | | Before |
| 6/10/1984 | Cle | Rhomberg | Demoted to reserve roster | | | Before |
| 6/10/1984 | KC | Jackson | Demoted to reserve roster | | | Before |
| 6/10/1984 | KC | Jones,M | Promoted to active roster | | | Before |
| 6/10/1984 | LA | Stubbs | Demoted to reserve roster | | | Before |
| 6/10/1984 | LA | Vail | Signed | | | Before |
| 6/10/1984 | Mil | Tellmann | Activated from disabled list | | | Before |
| 6/10/1984 | Sea | Henderson,S | Placed on disabled list | | 6/10/1984 | Before |
| 6/11/1984 | ChA | Parsons | Promoted to active roster | | | Before |
| 6/11/1984 | ChA | Skinner | Demoted to reserve roster | | | Before |
| 6/11/1984 | Det | Abbott | Demoted to reserve roster | | | Before |
| 6/11/1984 | Det | Monge | Acquired via trade | SD | | Before |
| 6/11/1984 | SD | Monge | Traded away | Det | | Before |
| 6/11/1984 | SD | Salazar | Activated from disabled list | | | Before |
| 6/12/1984 | Sea | Chambers | Promoted to active roster | | | Before |
| 6/12/1984 | Sea | Nunez | Promoted to active roster | | | Before |
| 6/12/1984 | Sea | Thomas,R | Placed on disabled list | | 6/12/1984 | Before |
| 6/12/1984 | Tex | Stein | Activated from disabled list | | | Before |
| 6/12/1984 | Tex | Wright,G | Placed on disabled list | | 6/12/1984 | Before |
| 6/13/1984 | Cal | Aase | Activated from disabled list | | | Before |
| 6/13/1984 | Cal | LaCorte | Placed on disabled list | | 6/13/1984 | Before |
| 6/13/1984 | ChA | Christmas | Promoted to active roster | | | Before |
| 6/13/1984 | ChA | Fisk | Placed on disabled list | | 6/13/1984 | Before |
| 6/13/1984 | ChA | Parsons | Demoted to reserve roster | | | Before |
| 6/13/1984 | ChA | Skinner | Promoted to active roster | | | Before |
| 6/13/1984 | Cin | Cato | Demoted to reserve roster | | | Before |
| 6/13/1984 | Cin | Cedeno | Activated from disabled list | | | Before |
| 6/13/1984 | Oak | Heimueller | Promoted to active roster | | | Before |
| 6/13/1984 | Oak | Warren | Demoted to reserve roster | | | Before |
| 6/14/1984 | Atl | Harper | Demoted to reserve roster | | | Before |
| 6/14/1984 | Atl | Washington | Activated from disabled list | | | Before |
| 6/14/1984 | ChN | Altamirano | Demoted to reserve roster | | | Before |
| 6/14/1984 | ChN | Cotto | Demoted to reserve roster | | | Before |
| 6/14/1984 | ChN | Frazier | Acquired via trade | Cle | | Before |
| 6/14/1984 | ChN | Hassey | Acquired via trade | Cle | | Before |
| 6/14/1984 | ChN | Meridith | Demoted to reserve roster | | | Before |
| 6/14/1984 | ChN | Schulze | Traded away | Cle | | Before |
| 6/14/1984 | ChN | Sutcliffe | Acquired via trade | Cle | | Before |
| 6/14/1984 | Cle | Bando | Promoted to active roster | | | Before |
| 6/14/1984 | Cle | Frazier | Traded away | ChN | | Before |
| 6/14/1984 | Cle | Hassey | Traded away | ChN | | Before |
| 6/14/1984 | Cle | Schulze | Acquired via trade | ChN | | Before |
| 6/14/1984 | Cle | Schulze | Demoted to reserve roster | | | Before |
| 6/14/1984 | Cle | Sutcliffe | Traded away | ChN | | Before |
| 6/15/1984 | Atl | Dayley | Traded away | StL | | Before |
| 6/15/1984 | Atl | Jorgensen | Traded away | StL | | Before |
| 6/15/1984 | Atl | Oberkfell | Acquired via trade | StL | | Before |
| 6/15/1984 | Cin | Berenyi | Traded away | NYN | | Before |
| 6/15/1984 | Cin | Puleo | Promoted to active roster | | | Before |
| 6/15/1984 | Cle | Easterly | Activated from disabled list | | | Before |
| 6/15/1984 | Mon | Francona | Placed on disabled list | | 6/15/1984 | Before |
| 6/15/1984 | Mon | Salazar | Promoted to active roster | | | Before |
| 6/15/1984 | NYA | Meacham | Promoted to active roster | | | Before |
| 6/15/1984 | NYA | Robertson | Demoted to reserve roster | | | Before |
| 6/15/1984 | NYN | Berenyi | Acquired via trade | Cin | | Before |
| 6/15/1984 | NYN | Torrez | Demoted to reserve roster | | | Before |
| 6/15/1984 | Pit | Otis | Activated from disabled list | | | Before |
| 6/15/1984 | Pit | Vargas | Demoted to reserve roster | | | Before |
| 6/15/1984 | StL | Dayley | Acquired via trade | Atl | | Before |
| 6/15/1984 | StL | Green | Activated from disabled list | | | Before |
| 6/15/1984 | StL | Jorgensen | Acquired via trade | Atl | | Before |
| 6/15/1984 | StL | LaPoint | Placed on disabled list | | 6/15/1984 | Before |
| 6/15/1984 | StL | Lyons | Demoted to reserve roster | | | Before |
| 6/15/1984 | StL | Oberkfell | Traded away | Atl | | Before |
| 6/15/1984 | StL | Rajsich | Demoted to reserve roster | | | Before |
| 6/15/1984 | StL | Salas | Promoted to active roster | | | Before |
| 6/16/1984 | Atl | Linares | Promoted to active roster | | | Before |
| 6/16/1984 | Atl | Runge | Demoted to reserve roster | | | Before |
| 6/16/1984 | NYA | Armstrong | Activated from disabled list | | | Before |
| 6/16/1984 | NYA | Christiansen | Demoted to reserve roster | | | Before |
| 6/16/1984 | Tor | Hernandez | Promoted to active roster | | | Before |
| 6/16/1984 | Tor | Whitt | Placed on disabled list | | 6/16/1984 | Before |
| 6/17/1984 | Hou | Ryan | Activated from disabled list | | | Before |
| 6/17/1984 | Hou | Scott,T | Demoted to reserve roster | | | Before |
| 6/17/1984 | NYA | Dayett | Promoted to active roster | | | Before |
| 6/17/1984 | NYA | Piniella | Released | | | Before |
| 6/17/1984 | NYA | Righetti | Placed on disabled list | | 6/17/1984 | Before |
| 6/17/1984 | StL | Citarella | Promoted to active roster | | | Before |
| 6/17/1984 | StL | Cox | Demoted to reserve roster | | | Before |
| 6/18/1984 | Bos | Johnson | Placed on disabled list | | 6/18/1984 | Before |
| 6/18/1984 | Hou | Ryan | Placed on disabled list | | 6/18/1984 | Before |
| 6/18/1984 | Hou | Solano | Promoted to active roster | | | Before |
| 6/18/1984 | NYA | Christiansen | Promoted to active roster | | | Before |
| 6/18/1984 | Phi | Lefebvre | Placed on disabled list | | 6/18/1984 | Before |
| 6/18/1984 | Phi | Stone | Promoted to active roster | | | Before |
| 6/19/1984 | ChN | Cotto | Promoted to active roster | | | Before |
| 6/19/1984 | ChN | Hall | Traded away | Cle | | Before |
| 6/19/1984 | Cle | Carter | Signed | | | Before |
| 6/19/1984 | Cle | Hall | Acquired via trade | ChN | | Before |
| 6/19/1984 | Cle | Nixon | Demoted to reserve roster | | | Before |
| 6/20/1984 | Cle | Farr | Placed on disabled list | | 6/20/1984 | Before |
| 6/20/1984 | Cle | Smith | Promoted to active roster | | | Before |
| 6/20/1984 | LA | Rodas | Placed on disabled list | | 6/20/1984 | Before |
| 6/20/1984 | Oak | Codiroli | Demoted to reserve roster | | | Before |
| 6/20/1984 | Oak | Young | Promoted to active roster | | | Before |
| 6/21/1984 | Bos | Brown | Promoted to active roster | | | Before |
| 6/21/1984 | ChA | Christmas | Demoted to reserve roster | | | Before |
| 6/21/1984 | ChA | Spillner | Acquired via trade | Cle | | Before |
| 6/21/1984 | Cle | Schulze | Promoted to active roster | | | Before |
| 6/21/1984 | Cle | Spillner | Traded away | ChA | | Before |
| 6/21/1984 | KC | Biancalana | Promoted to active roster | | | Before |
| 6/21/1984 | KC | Concepcion | Placed on disabled list | | 6/21/1984 | Before |
| 6/21/1984 | Phi | Diaz | Placed on disabled list | | 6/21/1984 | Before |
| 6/21/1984 | Phi | Russell | Promoted to active roster | | | Before |
| 6/22/1984 | LA | Howell | Promoted to active roster | | | Before |
| 6/22/1984 | LA | Monday | Released | | | Before |
| 6/22/1984 | LA | Stubbs | Promoted to active roster | | | Before |
| 6/22/1984 | NYN | Torrez | Released | | | Before |
| 6/23/1984 | ChA | Reed | Activated from disabled list | | | Before |
| 6/23/1984 | ChA | Roberge | Placed on disabled list | | 6/23/1984 | Before |
| 6/23/1984 | Mil | Porter | Activated from disabled list | | | Before |
| 6/23/1984 | Mil | Ready | Demoted to reserve roster | | | Before |
| 6/24/1984 | Atl | Dedmon | Promoted to active roster | | | Before |
| 6/24/1984 | Atl | Forster | Placed on disabled list | | 6/24/1984 | Before |
| 6/24/1984 | ChN | Bosley | Promoted to active roster | | | Before |
| 6/24/1984 | ChN | Durham | Placed on disabled list | | 6/24/1984 | Before |
| 6/24/1984 | Min | David | Promoted to active roster | | | Before |
| 6/24/1984 | Min | Hart | Demoted to reserve roster | | | Before |
| 6/24/1984 | Min | Lysander | Promoted to active roster | | | Before |
| 6/24/1984 | Min | Pashnick | Demoted to reserve roster | | | Before |
| 6/24/1984 | Sea | Coles | Demoted to reserve roster | | | Before |
| 6/24/1984 | Sea | Presley | Promoted to active roster | | | Before |
| 6/25/1984 | Sea | Beard | Placed on disabled list | | 6/25/1984 | Before |
| 6/25/1984 | Sea | Henderson,S | Activated from disabled list | | | Before |
| 6/25/1984 | Sea | Milbourne | Placed on disabled list | | 6/25/1984 | Before |
| 6/26/1984 | ChA | Siwy | Released | | | Before |
| 6/26/1984 | SF | Clark | Placed on disabled list | | 6/26/1984 | Before |
| 6/26/1984 | SF | Garrelts | Demoted to reserve roster | | | Before |
| 6/26/1984 | SF | Gladden | Promoted to active roster | | | Before |
| 6/26/1984 | SF | Hammaker | Activated from disabled list | | | Before |
| 6/27/1984 | Oak | Essian | Placed on disabled list | | 6/27/1984 | Before |
| 6/27/1984 | Oak | Tettleton | Promoted to active roster | | | Before |
| 6/27/1984 | Tex | Bannister | Placed on disabled list | | 6/27/1984 | Before |
| 6/27/1984 | Tex | Henke | Promoted to active roster | | | Before |
| 6/28/1984 | Atl | Washington | Suspended | | | Before |
| 6/28/1984 | ChA | Barojas | Traded away | Sea | | Before |
| 6/28/1984 | ChA | Nelson | Signed | | | Before |
| 6/28/1984 | Pit | Belliard | Placed on disabled list | | 6/28/1984 | Before |
| 6/28/1984 | Pit | Distefano | Demoted to reserve roster | | | Before |
| 6/28/1984 | Pit | Krawczyk | Promoted to active roster | | | Before |
| 6/28/1984 | Pit | Wotus | Promoted to active roster | | | Before |
| 6/28/1984 | SD | Chiffer | Demoted to reserve roster | | | Before |
| 6/28/1984 | SD | DeLeon | Activated from disabled list | | | Before |
| 6/28/1984 | Sea | Barojas | Acquired via trade | ChA | | Before |
| 6/29/1984 | Hou | Scott,T | Released | | | Before |
| 6/29/1984 | Mon | Johnson,Ron | Demoted to reserve roster | | | Before |
| 6/29/1984 | Mon | Scott | Signed | | | Before |
| 6/29/1984 | Oak | Codiroli | Promoted to active roster | | | Before |
| 6/29/1984 | Oak | Hancock | Demoted to reserve roster | | | Before |
| 6/29/1984 | Oak | Jones | Placed on disabled list | | 6/29/1984 | Before |
| 6/29/1984 | Oak | Warren | Promoted to active roster | | | Before |
| 6/30/1984 | ChA | Boston | Promoted to active roster | | | Before |
| 6/30/1984 | ChA | Paciorek | Placed on disabled list | | 6/30/1984 | Before |
| 6/30/1984 | Cin | Davis | Promoted to active roster | | | Before |
| 6/30/1984 | Cin | Milner | Placed on disabled list | | 6/30/1984 | Before |
| 6/30/1984 | NYA | Bystrom | Acquired via trade | Phi | | Before |
| 6/30/1984 | NYA | Rawley | Traded away | Phi | | Before |
| 6/30/1984 | Phi | Bystrom | Traded away | NYA | | Before |
| 6/30/1984 | Phi | Rawley | Acquired via trade | NYA | | Before |
| 6/30/1984 | StL | Dayley | Demoted to reserve roster | | | Before |
| 6/30/1984 | StL | Kepshire | Promoted to active roster | | | Before |
| 6/30/1984 | StL | LaPoint | Activated from disabled list | | | Before |
| 6/30/1984 | StL | Stuper | Demoted to reserve roster | | | Before |
| 7/1/1984 | Atl | Washington | Reinstated | | | Before |
| 7/1/1984 | Cal | Schofield | Placed on disabled list | | 7/1/1984 | Before |
| 7/1/1984 | KC | Huismann | Promoted to active roster | | | Before |
| 7/1/1984 | KC | Splittorff | Released | | | Before |
| 7/1/1984 | Mil | Caldwell | Activated from disabled list | | | Before |
| 7/1/1984 | Mil | Lazorko | Demoted to reserve roster | | | Before |
| 7/1/1984 | Mon | Ramsey | Acquired via trade | StL | | Before |
| 7/1/1984 | Mon | Speier | Traded away | StL | | Before |
| 7/1/1984 | StL | Ramsey | Traded away | Mon | | Before |
| 7/1/1984 | StL | Speier | Acquired via trade | Mon | | Before |
| 7/1/1984 | Tex | Dunbar | Promoted to active roster | | | Before |
| 7/1/1984 | Tex | Hostetler | Demoted to reserve roster | | | Before |
| 7/1/1984 | Tor | Hernandez | Demoted to reserve roster | | | Before |
| 7/1/1984 | Tor | Whitt | Activated from disabled list | | | Before |
| 7/2/1984 | ChN | Noles | Traded away | Tex | | Before |
| 7/2/1984 | Cin | Soto | Suspended | | | Before |
| 7/2/1984 | Cle | Carter | Placed on disabled list | | 7/2/1984 | Before |
| 7/2/1984 | Det | Baker | Promoted to active roster | | | Before |
| 7/2/1984 | Det | Willis | Demoted to reserve roster | | | Before |
| 7/2/1984 | LA | Bream | Promoted to active roster | | | Before |
| 7/2/1984 | LA | Brock | Demoted to reserve roster | | | Before |
| 7/2/1984 | LA | Diaz | Demoted to reserve roster | | | Before |
| 7/2/1984 | LA | Reynolds | Placed on disabled list | | 7/2/1984 | Before |
| 7/2/1984 | LA | Rivera | Promoted to active roster | | | Before |
| 7/2/1984 | LA | White | Promoted to active roster | | | Before |
| 7/2/1984 | NYA | Christiansen | Demoted to reserve roster | | | Before |
| 7/2/1984 | NYA | Righetti | Activated from disabled list | | | Before |
| 7/2/1984 | Phi | Carman | Promoted to active roster | | | Before |
| 7/2/1984 | Phi | Wehrmeister | Demoted to reserve roster | | | Before |
| 7/2/1984 | Pit | Distefano | Promoted to active roster | | | Before |
| 7/2/1984 | Pit | Tunnell | Placed on disabled list | | 7/2/1984 | Before |
| 7/2/1984 | Sea | Geisel | Promoted to active roster | | | Before |
| 7/2/1984 | Sea | Stoddard | Demoted to reserve roster | | | Before |
| 7/2/1984 | StL | Citarella | Placed on disabled list | | 7/2/1984 | Before |
| 7/2/1984 | StL | Ownbey | Promoted to active roster | | | Before |
| 7/2/1984 | Tex | Henke | Demoted to reserve roster | | | Before |
| 7/2/1984 | Tex | Noles | Acquired via trade | ChN | | Before |
| 7/3/1984 | Bos | Brown | Demoted to reserve roster | | | Before |
| 7/3/1984 | Bos | Johnson | Activated from disabled list | | | Before |
| 7/3/1984 | Hou | Madden | Demoted to reserve roster | | | Before |
| 7/3/1984 | Hou | Ryan | Activated from disabled list | | | Before |
| 7/3/1984 | NYA | Harrah | Placed on disabled list | | 7/3/1984 | Before |
| 7/3/1984 | Oak | Torrez | Signed | | | Before |
| 7/3/1984 | Oak | Torrez | Demoted to reserve roster | | | Before |
| 7/4/1984 | Atl | Harper | Promoted to active roster | | | Before |
| 7/4/1984 | Atl | Watson | Placed on disabled list | | 7/4/1984 | Before |
| 7/4/1984 | Sea | Thomas,R | Activated from disabled list | | | Before |
| 7/4/1984 | Sea | Young | Placed on disabled list | | 7/4/1984 | Before |
| 7/5/1984 | ChA | Boston | Demoted to reserve roster | | | Before |
| 7/5/1984 | ChA | Fisk | Activated from disabled list | | | Before |
| 7/5/1984 | ChN | Hassey | Placed on disabled list | | 7/5/1984 | Before |
| 7/5/1984 | ChN | Rohn | Promoted to active roster | | | Before |
| 7/5/1984 | ChN | Sanderson | Activated from disabled list | | | Before |
| 7/5/1984 | Cle | Farr | Activated from disabled list | | | Before |
| 7/5/1984 | Min | Castillo | Activated from disabled list | | | Before |
| 7/5/1984 | Min | Williams | Placed on disabled list | | 7/5/1984 | Before |
| 7/5/1984 | NYA | Cerone | Activated from disabled list | | | Before |
| 7/5/1984 | NYA | O'Berry | Demoted to reserve roster | | | Before |
| 7/5/1984 | Sea | Mercado | Promoted to active roster | | | Before |
| 7/5/1984 | Sea | Nahorodny | Demoted to reserve roster | | | Before |
| 7/6/1984 | KC | White | Placed on disabled list | | 7/6/1984 | Before |
| 7/6/1984 | Mil | Moore | Placed on disabled list | | 7/6/1984 | Before |
| 7/7/1984 | Cin | Soto | Reinstated | | | Before |
| 7/7/1984 | NYA | Pagliarulo | Promoted to active roster | | | Before |
| 7/7/1984 | Oak | Hill | Promoted to active roster | | | Before |
| 7/7/1984 | Oak | Lopes | Placed on disabled list | | 7/7/1984 | Before |
| 7/7/1984 | Phi | Stone | Placed on disabled list | | 7/7/1984 | Before |
| 7/7/1984 | SF | Lerch | Placed on disabled list | | 7/7/1984 | Before |
| 7/7/1984 | SF | Trillo | Activated from disabled list | | | Before |
| 7/8/1984 | KC | Concepcion | Activated from disabled list | | | Before |
| 7/9/1984 | Cin | Pastore | Placed on disabled list | | 7/9/1984 | Before |
| 7/9/1984 | Det | Abbott | Promoted to active roster | | | Before |
| 7/9/1984 | Det | Trammell | Placed on disabled list | | 7/9/1984 | Before |
| 7/9/1984 | NYA | Rijo | Demoted to reserve roster | | | Before |
| 7/9/1984 | NYN | Leary | Demoted to reserve roster | | | Before |
| 7/9/1984 | NYN | Oquendo | Demoted to reserve roster | | | Before |
| 7/9/1984 | Oak | Heimueller | Demoted to reserve roster | | | Before |
| 7/10/1984 | Sea | Chambers | Demoted to reserve roster | | | Before |
| 7/10/1984 | Sea | Milbourne | Activated from disabled list | | | Before |
| 7/11/1984 | Cin | Barnes | Promoted to active roster | | | Before |
| 7/11/1984 | Cin | Bilardello | Demoted to reserve roster | | | Before |
| 7/11/1984 | Cin | Cato | Promoted to active roster | | | Before |
| 7/11/1984 | Cin | Lawless | Demoted to reserve roster | | | Before |
| 7/11/1984 | Cin | Lesley | Promoted to active roster | | | Before |
| 7/11/1984 | Cin | Puleo | Demoted to reserve roster | | | Before |
| 7/11/1984 | Cin | Scherrer | Demoted to reserve roster | | | Before |
| 7/11/1984 | Cin | Tibbs | Promoted to active roster | | | Before |
| 7/11/1984 | Cin | Van Gorder | Promoted to active roster | | | Before |
| 7/11/1984 | Mil | Candiotti | Promoted to active roster | | | Before |
| 7/11/1984 | Mil | Gibson | Demoted to reserve roster | | | Before |
| 7/11/1984 | Mil | Lozado | Promoted to active roster | | | Before |
| 7/11/1984 | NYA | Cowley | Promoted to active roster | | | Before |
| 7/11/1984 | NYN | Fernandez | Promoted to active roster | | | Before |
| 7/11/1984 | NYN | Martin | Demoted to reserve roster | | | Before |
| 7/11/1984 | NYN | Santana | Promoted to active roster | | | Before |
| 7/11/1984 | NYN | Stearns | Activated from disabled list | | | Before |
| 7/11/1984 | SF | Lacey | Promoted to active roster | | | Before |
| 7/11/1984 | SF | Mullins | Placed on disabled list | | 7/11/1984 | Before |
| 7/11/1984 | Tex | Tobik | Demoted to reserve roster | | | Before |
| 7/12/1984 | ChN | Durham | Activated from disabled list | | | Before |
| 7/12/1984 | ChN | Rohn | Demoted to reserve roster | | | Before |
| 7/12/1984 | LA | Reuss | Activated from disabled list | | | Before |
| 7/12/1984 | LA | White | Demoted to reserve roster | | | Before |
| 7/12/1984 | StL | McGee | Placed on disabled list | | 7/12/1984 | Before |
| 7/12/1984 | Tex | Wright,G | Activated from disabled list | | | Before |
| 7/13/1984 | Cal | Sconiers | Activated from disabled list | | | Before |
| 7/13/1984 | ChN | Hebner | Placed on disabled list | | 7/13/1984 | Before |
| 7/13/1984 | Hou | Pankovitz | Demoted to reserve roster | | | Before |
| 7/13/1984 | Hou | Pena | Promoted to active roster | | | Before |
| 7/13/1984 | Pit | Guante | Placed on disabled list | | 7/13/1984 | Before |
| 7/13/1984 | Pit | Krawczyk | Demoted to reserve roster | | | Before |
| 7/13/1984 | Pit | Winn | Promoted to active roster | | | Before |
| 7/13/1984 | Pit | Zaske | Promoted to active roster | | | Before |
| 7/14/1984 | Pit | Otis | Placed on disabled list | | 7/14/1984 | Before |
| 7/14/1984 | StL | Smith,O | Placed on disabled list | | 7/14/1984 | Before |
| 7/15/1984 | KC | Davis | Demoted to reserve roster | | | Before |
| 7/15/1984 | KC | Wills | Promoted to active roster | | | Before |
| 7/16/1984 | ChN | Rainey | Traded away | Oak | | Before |
| 7/16/1984 | ChN | Ruthven | Activated from disabled list | | | Before |
| 7/16/1984 | Hou | Spilman | Placed on disabled list | | 7/16/1984 | Before |
| 7/16/1984 | LA | Niedenfuer | Placed on disabled list | | 7/16/1984 | Before |
| 7/16/1984 | Oak | Rainey | Acquired via trade | ChN | | Before |
| 7/16/1984 | Oak | Warren | Demoted to reserve roster | | | Before |
| 7/16/1984 | Phi | Diaz | Activated from disabled list | | | Before |
| 7/16/1984 | Pit | Walk | Promoted to active roster | | | Before |
| 7/17/1984 | Cle | Aponte | Demoted to reserve roster | | | Before |
| 7/17/1984 | Cle | Carter | Activated from disabled list | | | Before |
| 7/17/1984 | Hou | Pankovitz | Promoted to active roster | | | Before |
| 7/17/1984 | LA | Reynolds | Activated from disabled list | | | Before |
| 7/17/1984 | NYA | Gamble | Placed on disabled list | | 7/17/1984 | Before |
| 7/17/1984 | Oak | Hancock | Promoted to active roster | | | Before |
| 7/17/1984 | StL | Citarella | Activated from disabled list | | | Before |
| 7/17/1984 | StL | Ownbey | Demoted to reserve roster | | | Before |
| 7/18/1984 | ChN | Rohn | Promoted to active roster | | | Before |
| 7/18/1984 | KC | Washington | Placed on disabled list | | 7/18/1984 | Before |
| 7/18/1984 | StL | Pendleton | Promoted to active roster | | | Before |
| 7/19/1984 | Bal | Dwyer | Placed on disabled list | | 7/19/1984 | Before |
| 7/19/1984 | Bal | Ford | Activated from disabled list | | | Before |
| 7/19/1984 | ChA | Burns | Placed on disabled list | | 7/19/1984 | Before |
| 7/19/1984 | ChA | Gleaton | Promoted to active roster | | | Before |
| 7/19/1984 | ChA | Jones | Demoted to reserve roster | | | Before |
| 7/19/1984 | ChA | Quirk | Promoted to active roster | | | Before |
| 7/19/1984 | ChA | Skinner | Demoted to reserve roster | | | Before |
| 7/19/1984 | ChA | Smalley | Acquired via trade | NYA | | Before |
| 7/19/1984 | NYA | Smalley | Traded away | ChA | | Before |
| 7/19/1984 | NYN | Martin | Promoted to active roster | | | Before |
| 7/19/1984 | NYN | Stearns | Placed on disabled list | | 7/19/1984 | Before |
| 7/19/1984 | Tex | Jones,B | Placed on disabled list | | 7/19/1984 | Before |
| 7/20/1984 | NYA | Harrah | Activated from disabled list | | | Before |
| 7/20/1984 | NYA | Mata | Promoted to active roster | | | Before |
| 7/20/1984 | NYN | Gardenhire | Placed on disabled list | | 7/20/1984 | Before |
| 7/20/1984 | NYN | Jones | Promoted to active roster | | | Before |
| 7/20/1984 | StL | Lyons | Promoted to active roster | | | Before |
| 7/20/1984 | StL | Nieto | Promoted to active roster | | | Before |
| 7/20/1984 | StL | Salas | Demoted to reserve roster | | | Before |
| 7/21/1984 | KC | White | Activated from disabled list | | | Before |
| 7/21/1984 | Mon | Harris | Traded away | SD | | Before |
| 7/21/1984 | SD | DeLeon | Placed on disabled list | | 7/21/1984 | Before |
| 7/21/1984 | SD | Harris | Acquired via trade | Mon | | Before |
| 7/22/1984 | Atl | Harper | Demoted to reserve roster | | | Before |
| 7/22/1984 | Atl | Watson | Activated from disabled list | | | Before |
| 7/22/1984 | LA | Amelung | Promoted to active roster | | | Before |
| 7/22/1984 | LA | Guerrero | Placed on disabled list | | 7/22/1984 | Before |
| 7/22/1984 | Min | Walters | Demoted to reserve roster | | | Before |
| 7/22/1984 | Oak | Codiroli | Demoted to reserve roster | | | Before |
| 7/22/1984 | Oak | Torrez | Promoted to active roster | | | Before |
| 7/22/1984 | Phi | Matuszek | Activated from disabled list | | | Before |
| 7/22/1984 | Phi | Russell | Demoted to reserve roster | | | Before |
| 7/22/1984 | StL | Brummer | Placed on disabled list | | 7/22/1984 | Before |
| 7/22/1984 | StL | Cox | Promoted to active roster | | | Before |
| 7/23/1984 | Mil | Moore | Activated from disabled list | | | Before |
| 7/23/1984 | Mil | Porter | Placed on disabled list | | 7/23/1984 | Before |
| 7/23/1984 | Pit | Tunnell | Activated from disabled list | | | Before |
| 7/23/1984 | Pit | Walk | Placed on disabled list | | 7/23/1984 | Before |
| 7/23/1984 | SF | O'Malley | Promoted to active roster | | | Before |
| 7/23/1984 | SF | Oliver | Placed on disabled list | | 7/23/1984 | Before |
| 7/23/1984 | Tex | Kunkel | Promoted to active roster | | | Before |
| 7/24/1984 | Cal | Jackson,Ro | Demoted to reserve roster | | | Before |
| 7/24/1984 | Cal | Schofield | Activated from disabled list | | | Before |
| 7/24/1984 | Mil | Beene | Promoted to active roster | | | Before |
| 7/24/1984 | Mil | Fingers | Placed on disabled list | | 7/24/1984 | Before |
| 7/24/1984 | Tex | Anderson | Demoted to reserve roster | | | Before |
| 7/24/1984 | Tex | Bannister | Activated from disabled list | | | Before |
| 7/25/1984 | ChA | Roberge | Activated from disabled list | | | Before |
| 7/25/1984 | ChA | Stegman | Demoted to reserve roster | | | Before |
| 7/26/1984 | Mon | Gonzales | Promoted to active roster | | | Before |
| 7/26/1984 | Mon | Little | Demoted to reserve roster | | | Before |
| 7/26/1984 | Mon | Salazar | Demoted to reserve roster | | | Before |
| 7/26/1984 | Mon | Venable | Promoted to active roster | | | Before |
| 7/26/1984 | SF | Calvert | Promoted to active roster | | | Before |
| 7/26/1984 | SF | Cornell | Demoted to reserve roster | | | Before |
| 7/27/1984 | Cin | Driessen | Traded away | Mon | | Before |
| 7/27/1984 | Cin | McGaffigan | Acquired via trade | Mon | | Before |
| 7/27/1984 | Mon | Driessen | Acquired via trade | Cin | | Before |
| 7/27/1984 | Mon | McGaffigan | Traded away | Cin | | Before |
| 7/27/1984 | Phi | Kern | Released | | | Before |
| 7/27/1984 | Phi | McGraw | Activated from disabled list | | | Before |
| 7/27/1984 | StL | Citarella | Demoted to reserve roster | | | Before |
| 7/27/1984 | StL | McGee | Activated from disabled list | | | Before |
| 7/28/1984 | ChA | Paciorek | Activated from disabled list | | | Before |
| 7/28/1984 | ChA | Quirk | Demoted to reserve roster | | | Before |
| 7/29/1984 | NYN | Gardner | Promoted to active roster | | | Before |
| 7/29/1984 | NYN | Jones | Demoted to reserve roster | | | Before |
| 7/29/1984 | Sea | Beard | Activated from disabled list | | | Before |
| 7/29/1984 | Sea | Thomas,R | Demoted to reserve roster | | | Before |
| 7/29/1984 | Sea | Young | Activated from disabled list | | | Before |
| 7/29/1984 | Sea | Young | Demoted to reserve roster | | | Before |
| 7/30/1984 | Cin | Cato | Demoted to reserve roster | | | Before |
| 7/30/1984 | Phi | Carman | Demoted to reserve roster | | | Before |
| 7/30/1984 | Phi | Denny | Activated from disabled list | | | Before |
| 7/30/1984 | Pit | Guante | Activated from disabled list | | | Before |
| 7/30/1984 | Pit | Guante | Demoted to reserve roster | | | Before |
| 7/30/1984 | SF | Calvert | Demoted to reserve roster | | | Before |
| 7/30/1984 | SF | Cornell | Promoted to active roster | | | Before |
| 7/31/1984 | Cin | Pastore | Activated from disabled list | | | Before |
| 7/31/1984 | Det | Trammell | Activated from disabled list | | | Before |
| 7/31/1984 | LA | Bream | Demoted to reserve roster | | | Before |
| 7/31/1984 | LA | Brewer | Promoted to active roster | | | Before |
| 7/31/1984 | LA | Brock | Promoted to active roster | | | Before |
| 7/31/1984 | LA | Niedenfuer | Activated from disabled list | | | Before |
| 7/31/1984 | LA | Reynolds | Demoted to reserve roster | | | Before |
| 7/31/1984 | LA | Vail | Demoted to reserve roster | | | Before |
| 7/31/1984 | Oak | Essian | Activated from disabled list | | | Before |
| 7/31/1984 | Oak | Hancock | Placed on disabled list | | 7/31/1984 | Before |
| 8/1/1984 | Det | Baker | Demoted to reserve roster | | | Before |
| 8/1/1984 | KC | Wills | Placed on disabled list | | 8/1/1984 | Before |
| 8/1/1984 | NYA | Bystrom | Placed on disabled list | | 8/1/1984 | Before |
| 8/2/1984 | Bal | Lowenstein | Placed on disabled list | | 8/2/1984 | Before |
| 8/2/1984 | Cal | Jackson,Ro | Released | | | Before |
| 8/2/1984 | KC | Biancalana | Demoted to reserve roster | | | Before |
| 8/2/1984 | KC | Jones,L | Activated from disabled list | | | Before |
| 8/2/1984 | KC | Washington | Activated from disabled list | | | Before |
| 8/2/1984 | Mil | Candiotti | Placed on disabled list | | 8/2/1984 | Before |
| 8/2/1984 | Mil | Searage | Promoted to active roster | | | Before |
| 8/2/1984 | Min | Walters | Promoted to active roster | | | Before |
| 8/3/1984 | ChN | Lake | Activated from disabled list | | | Before |
| 8/3/1984 | ChN | Rohn | Demoted to reserve roster | | | Before |
| 8/3/1984 | NYA | Deshaies | Promoted to active roster | | | Before |
| 8/3/1984 | Phi | Maddox | Placed on disabled list | | 8/3/1984 | Before |
| 8/4/1984 | Atl | Barker | Placed on disabled list | | 8/4/1984 | Before |
| 8/4/1984 | Atl | Forster | Activated from disabled list | | | Before |
| 8/4/1984 | Hou | Pena | Placed on disabled list | | 8/4/1984 | Before |
| 8/4/1984 | Hou | Richardt | Promoted to active roster | | | Before |
| 8/4/1984 | Mon | Gonzales | Demoted to reserve roster | | | Before |
| 8/4/1984 | Mon | Grapenthin | Promoted to active roster | | | Before |
| 8/4/1984 | Pit | Otis | Activated from disabled list | | | Before |
| 8/4/1984 | Pit | Zaske | Demoted to reserve roster | | | Before |
| 8/4/1984 | SF | Calvert | Promoted to active roster | | | Before |
| 8/4/1984 | SF | Hammaker | Placed on disabled list | | 8/4/1984 | Before |
| 8/4/1984 | SF | O'Malley | Demoted to reserve roster | | | Before |
| 8/5/1984 | Bal | Brown | Promoted to active roster | | | Before |
| 8/5/1984 | Bal | Nolan | Activated from disabled list | | | Before |
| 8/5/1984 | Bal | Swaggerty | Demoted to reserve roster | | | Before |
| 8/5/1984 | Cin | Walker | Placed on disabled list | | 8/5/1984 | Before |
| 8/5/1984 | LA | Niedenfuer | Placed on disabled list | | 8/5/1984 | Before |
| 8/5/1984 | Mon | Hesketh | Promoted to active roster | | | Before |
| 8/5/1984 | Mon | Palmer | Placed on disabled list | | 8/5/1984 | Before |
| 8/5/1984 | Pit | Green | Promoted to active roster | | | Before |
| 8/5/1984 | Pit | Scurry | Placed on disabled list | | 8/5/1984 | Before |
| 8/6/1984 | Cin | Milner | Activated from disabled list | | | Before |
| 8/6/1984 | Det | Kuntz | Demoted to reserve roster | | | Before |
| 8/6/1984 | Det | Willis | Promoted to active roster | | | Before |
| 8/6/1984 | LA | Guerrero | Activated from disabled list | | | Before |
| 8/6/1984 | Mil | Sundberg | Placed on disabled list | | 8/6/1984 | Before |
| 8/6/1984 | Phi | Stone | Activated from disabled list | | | Before |
| 8/6/1984 | Pit | Distefano | Demoted to reserve roster | | | Before |
| 8/6/1984 | Pit | Gonzalez | Promoted to active roster | | | Before |
| 8/6/1984 | Pit | Otis | Released | | | Before |
| 8/6/1984 | Pit | Page | Promoted to active roster | | | Before |
| 8/7/1984 | Oak | Lopes | Activated from disabled list | | | Before |
| 8/7/1984 | Oak | Tettleton | Demoted to reserve roster | | | Before |
| 8/7/1984 | SF | Oliver | Activated from disabled list | | | Before |
| 8/8/1984 | Atl | Brizzolara | Promoted to active roster | | | Before |
| 8/8/1984 | Atl | Dedmon | Demoted to reserve roster | | | Before |
| 8/8/1984 | Bos | Gale | Demoted to reserve roster | | | Before |
| 8/8/1984 | Bos | Mitchell | Promoted to active roster | | | Before |
| 8/8/1984 | ChN | Bordi | Placed on disabled list | | 8/8/1984 | Before |
| 8/8/1984 | ChN | Veryzer | Activated from disabled list | | | Before |
| 8/8/1984 | Oak | Burgmeier | Activated from disabled list | | | Before |
| 8/8/1984 | Oak | Torrez | Released | | | Before |
| 8/9/1984 | Cal | Carew | Placed on disabled list | | 8/9/1984 | Before |
| 8/9/1984 | Det | Baker | Promoted to active roster | | | Before |
| 8/9/1984 | Det | Willis | Demoted to reserve roster | | | Before |
| 8/9/1984 | NYN | Gardenhire | Activated from disabled list | | | Before |
| 8/9/1984 | NYN | Sisk | Placed on disabled list | | 8/9/1984 | Before |
| 8/9/1984 | Tex | Stein | Placed on disabled list | | 8/9/1984 | Before |
| 8/10/1984 | Cal | Zahn | Placed on disabled list | | 8/10/1984 | Before |
| 8/10/1984 | Mil | Lazorko | Promoted to active roster | | | Before |
| 8/10/1984 | Phi | Hudson | Placed on disabled list | | 8/10/1984 | Before |
| 8/10/1984 | Sea | Calderon | Promoted to active roster | | | Before |
| 8/10/1984 | Sea | Henderson,D | Placed on disabled list | | 8/10/1984 | Before |
| 8/10/1984 | Tex | Dunbar | Demoted to reserve roster | | | Before |
| 8/10/1984 | Tex | Henke | Promoted to active roster | | | Before |
| 8/10/1984 | Tex | Jones,B | Activated from disabled list | | | Before |
| 8/11/1984 | Atl | Dedmon | Promoted to active roster | | | Before |
| 8/11/1984 | Atl | Forster | Placed on disabled list | | 8/11/1984 | Before |
| 8/11/1984 | Cal | Curtis | Activated from disabled list | | | Before |
| 8/11/1984 | Cal | Jackson,Re | Suspended | | | Before |
| 8/11/1984 | KC | Biancalana | Promoted to active roster | | | Before |
| 8/11/1984 | KC | Concepcion | Placed on disabled list | | 8/11/1984 | Before |
| 8/12/1984 | Cal | Jackson,Re | Reinstated | | | Before |
| 8/12/1984 | Cin | Lesley | Demoted to reserve roster | | | Before |
| 8/12/1984 | LA | Diaz | Promoted to active roster | | | Before |
| 8/12/1984 | LA | Russell | Placed on disabled list | | 8/12/1984 | Before |
| 8/13/1984 | Cal | Miller | Promoted to active roster | | | Before |
| 8/13/1984 | Cin | Robinson | Promoted to active roster | | | Before |
| 8/13/1984 | LA | Bailor | Placed on disabled list | | 8/13/1984 | Before |
| 8/13/1984 | Pit | Madlock | Placed on disabled list | | 8/13/1984 | Before |
| 8/14/1984 | Bal | Jackson | Signed | | | Before |
| 8/14/1984 | Bal | Jackson | Demoted to reserve roster | | | Before |
| 8/14/1984 | Det | Abbott | Released | | | Before |
| 8/14/1984 | Det | Kuntz | Promoted to active roster | | | Before |
| 8/14/1984 | NYA | Deshaies | Demoted to reserve roster | | | Before |
| 8/14/1984 | NYA | Murray | Activated from disabled list | | | Before |
| 8/14/1984 | Pit | Vargas | Promoted to active roster | | | Before |
| 8/15/1984 | Phi | Carman | Promoted to active roster | | | Before |
| 8/16/1984 | Bos | Brown | Promoted to active roster | | | Before |
| 8/16/1984 | Bos | Ojeda | Placed on disabled list | | 8/16/1984 | Before |
| 8/16/1984 | Cin | Davis | Placed on disabled list | | 8/16/1984 | Before |
| 8/16/1984 | Cin | Lawless | Traded away | Mon | | Before |
| 8/16/1984 | Cin | Rose | Acquired via trade | Mon | | Before |
| 8/16/1984 | KC | Dent | Signed | | | Before |
| 8/16/1984 | KC | Roberts | Placed on disabled list | | 8/16/1984 | Before |
| 8/16/1984 | KC | Washington | Placed on disabled list | | 8/16/1984 | Before |
| 8/16/1984 | KC | Wills | Activated from disabled list | | | Before |
| 8/16/1984 | Mon | Lawless | Acquired via trade | Cin | | Before |
| 8/16/1984 | Mon | Lawless | Demoted to reserve roster | | | Before |
| 8/16/1984 | Mon | Rose | Traded away | Cin | | Before |
| 8/16/1984 | NYA | Guidry | Placed on disabled list | | 8/16/1984 | Before |
| 8/16/1984 | NYA | Montefusco | Activated from disabled list | | | Before |
| 8/16/1984 | Tor | Acker | Placed on disabled list | | 8/16/1984 | Before |
| 8/16/1984 | Tor | Musselman | Promoted to active roster | | | Before |
| 8/17/1984 | Atl | Bedrosian | Suspended | | | Before |
| 8/17/1984 | Atl | Mahler | Suspended | | | Before |
| 8/17/1984 | Atl | Perry | Suspended | | | Before |
| 8/17/1984 | Bal | Ford | Placed on disabled list | | 8/17/1984 | Before |
| 8/17/1984 | LA | Landestoy | Promoted to active roster | | | Before |
| 8/17/1984 | Mon | Gonzales | Promoted to active roster | | | Before |
| 8/17/1984 | SD | Summers | Suspended | | | Before |
| 8/17/1984 | SF | Cornell | Demoted to reserve roster | | | Before |
| 8/17/1984 | SF | Lerch | Activated from disabled list | | | Before |
| 8/18/1984 | Phi | Maddox | Activated from disabled list | | | Before |
| 8/18/1984 | Phi | Stone | Demoted to reserve roster | | | Before |
| 8/19/1984 | Det | Brookens | Placed on disabled list | | 8/19/1984 | Before |
| 8/19/1984 | Hou | Pena | Activated from disabled list | | | Before |
| 8/19/1984 | Hou | Richardt | Placed on disabled list | | 8/19/1984 | Before |
| 8/19/1984 | Phi | Corcoran | Placed on disabled list | | 8/19/1984 | Before |
| 8/19/1984 | Phi | Russell | Promoted to active roster | | | Before |
| 8/20/1984 | Atl | Bedrosian | Reinstated | | | Before |
| 8/20/1984 | Atl | Bedrosian | Placed on disabled list | | 8/20/1984 | Before |
| 8/20/1984 | Atl | Mahler | Reinstated | | | Before |
| 8/20/1984 | Atl | Payne | Promoted to active roster | | | Before |
| 8/20/1984 | Atl | Perry | Reinstated | | | Before |
| 8/20/1984 | Bal | Lowenstein | Activated from disabled list | | | Before |
| 8/20/1984 | ChA | Burns | Activated from disabled list | | | Before |
| 8/20/1984 | ChA | Gleaton | Demoted to reserve roster | | | Before |
| 8/20/1984 | Cle | Jacoby | Placed on disabled list | | 8/20/1984 | Before |
| 8/20/1984 | Min | Jimenez | Demoted to reserve roster | | | Before |
| 8/20/1984 | Min | Speier | Acquired via trade | StL | | Before |
| 8/20/1984 | NYN | Gardenhire | Placed on disabled list | | 8/20/1984 | Before |
| 8/20/1984 | NYN | Jones | Promoted to active roster | | | Before |
| 8/20/1984 | Phi | Diaz | Placed on disabled list | | 8/20/1984 | Before |
| 8/20/1984 | Phi | Maddox | Placed on disabled list | | 8/20/1984 | Before |
| 8/20/1984 | Phi | Oliver | Acquired via trade | SF | | Before |
| 8/20/1984 | SD | Summers | Reinstated | | | Before |
| 8/20/1984 | SF | Oliver | Traded away | Phi | | Before |
| 8/20/1984 | SF | Riley | Signed | | | Before |
| 8/20/1984 | SF | Riley | Demoted to reserve roster | | | Before |
| 8/20/1984 | StL | Smith,O | Activated from disabled list | | | Before |
| 8/20/1984 | StL | Speier | Traded away | Min | | Before |
| 8/21/1984 | Cle | Noboa | Promoted to active roster | | | Before |
| 8/21/1984 | LA | Whitfield | Placed on disabled list | | 8/21/1984 | Before |
| 8/21/1984 | SF | Gomez | Promoted to active roster | | | Before |
| 8/21/1984 | SF | Nicosia | Placed on disabled list | | 8/21/1984 | Before |
| 8/22/1984 | Min | Jimenez | Promoted to active roster | | | Before |
| 8/22/1984 | Min | Speier | Placed on disabled list | | 8/22/1984 | Before |
| 8/22/1984 | SF | Mullins | Activated from disabled list | | | Before |
| 8/23/1984 | ChN | Bordi | Activated from disabled list | | | Before |
| 8/23/1984 | ChN | Owen | Demoted to reserve roster | | | Before |
| 8/23/1984 | ChN | Reuschel | Placed on disabled list | | 8/23/1984 | Before |
| 8/23/1984 | SF | Calvert | Demoted to reserve roster | | | Before |
| 8/23/1984 | SF | Grant | Promoted to active roster | | | Before |
| 8/24/1984 | ChN | Rohn | Promoted to active roster | | | Before |
| 8/25/1984 | NYN | Oquendo | Promoted to active roster | | | Before |
| 8/25/1984 | NYN | Santana | Placed on disabled list | | 8/25/1984 | Before |
| 8/25/1984 | Phi | Melendez | Promoted to active roster | | | Before |
| 8/26/1984 | Sea | Calderon | Placed on disabled list | | 8/26/1984 | Before |
| 8/26/1984 | Sea | Moses | Promoted to active roster | | | Before |
| 8/27/1984 | Atl | Oberkfell | Placed on disabled list | | 8/27/1984 | Before |
| 8/27/1984 | Atl | Runge | Promoted to active roster | | | Before |
| 8/27/1984 | Cin | Scherrer | Traded away | Det | | Before |
| 8/27/1984 | Det | Scherrer | Acquired via trade | Cin | | Before |
| 8/27/1984 | LA | Russell | Activated from disabled list | | | Before |
| 8/27/1984 | Pit | Green | Demoted to reserve roster | | | Before |
| 8/27/1984 | Pit | Scurry | Activated from disabled list | | | Before |
| 8/28/1984 | Hou | Knight | Traded away | NYN | | Before |
| 8/28/1984 | NYN | Jones | Demoted to reserve roster | | | Before |
| 8/28/1984 | NYN | Knight | Acquired via trade | Hou | | Before |
| 8/28/1984 | Pit | Belliard | Activated from disabled list | | | Before |
| 8/28/1984 | Pit | Mazzilli | Placed on disabled list | | 8/28/1984 | Before |
| 8/29/1984 | Bal | Dwyer | Activated from disabled list | | | Before |
| 8/29/1984 | Bal | McGregor | Placed on disabled list | | 8/29/1984 | Before |
| 8/29/1984 | Min | Putnam | Acquired via trade | Sea | | Before |
| 8/29/1984 | NYN | Gardner | Demoted to reserve roster | | | Before |
| 8/29/1984 | NYN | Sisk | Activated from disabled list | | | Before |
| 8/29/1984 | Sea | Henderson,D | Activated from disabled list | | | Before |
| 8/29/1984 | Sea | Putnam | Traded away | Min | | Before |
| 8/30/1984 | Min | Brown | Demoted to reserve roster | | | Before |
| 8/30/1984 | Min | Wardle | Promoted to active roster | | | Before |
| 8/30/1984 | Min | Whitehouse | Demoted to reserve roster | | | Before |
| 8/30/1984 | Phi | Martin | Acquired via trade | SF | | Before |
| 8/30/1984 | Pit | Berra | Placed on disabled list | | 8/30/1984 | Before |
| 8/30/1984 | Pit | Orsulak | Promoted to active roster | | | Before |
| 8/30/1984 | SF | Martin | Traded away | Phi | | Before |
| 8/31/1984 | ChN | Johnstone | Demoted to reserve roster | | | Before |
| 8/31/1984 | ChN | Lopes | Acquired via trade | Oak | | Before |
| 8/31/1984 | Cin | Lesley | Promoted to active roster | | | Before |
| 8/31/1984 | Oak | Hancock | Activated from disabled list | | | Before |
| 8/31/1984 | Oak | Lopes | Traded away | ChN | | Before |
| 9/1/1984 | Atl | Forster | Activated from disabled list | | | Before |
| 9/1/1984 | Bal | Pacella | Promoted to active roster | | | Before |
| 9/1/1984 | Bal | Swaggerty | Promoted to active roster | | | Before |
| 9/1/1984 | Bos | Ojeda | Activated from disabled list | | | Before |
| 9/1/1984 | Cal | Burleson | Activated from disabled list | | | Before |
| 9/1/1984 | Cal | Carew | Activated from disabled list | | | Before |
| 9/1/1984 | Cal | LaCorte | Activated from disabled list | | | Before |
| 9/1/1984 | Cal | Zahn | Activated from disabled list | | | Before |
| 9/1/1984 | ChA | Boston | Promoted to active roster | | | Before |
| 9/1/1984 | ChA | O'Malley | Acquired via trade | SF | | Before |
| 9/1/1984 | ChN | Hassey | Activated from disabled list | | | Before |
| 9/1/1984 | ChN | Hatcher | Promoted to active roster | | | Before |
| 9/1/1984 | ChN | Hebner | Activated from disabled list | | | Before |
| 9/1/1984 | ChN | Johnson | Promoted to active roster | | | Before |
| 9/1/1984 | ChN | Meridith | Promoted to active roster | | | Before |
| 9/1/1984 | ChN | Owen | Promoted to active roster | | | Before |
| 9/1/1984 | ChN | Patterson | Promoted to active roster | | | Before |
| 9/1/1984 | ChN | Reuschel | Activated from disabled list | | | Before |
| 9/1/1984 | Cin | Davis | Activated from disabled list | | | Before |
| 9/1/1984 | Cin | Walker | Activated from disabled list | | | Before |
| 9/1/1984 | Cin | Willis | Acquired via trade | Det | | Before |
| 9/1/1984 | Cle | Moronko | Promoted to active roster | | | Before |
| 9/1/1984 | Cle | Roman | Promoted to active roster | | | Before |
| 9/1/1984 | Det | Willis | Traded away | Cin | | Before |
| 9/1/1984 | Hou | Calhoun | Promoted to active roster | | | Before |
| 9/1/1984 | Hou | Davis | Promoted to active roster | | | Before |
| 9/1/1984 | Hou | Madden | Promoted to active roster | | | Before |
| 9/1/1984 | Hou | Ross | Promoted to active roster | | | Before |
| 9/1/1984 | Hou | Tolman | Promoted to active roster | | | Before |
| 9/1/1984 | KC | Pujols | Signed | | | Before |
| 9/1/1984 | KC | Roberts | Activated from disabled list | | | Before |
| 9/1/1984 | LA | Bream | Promoted to active roster | | | Before |
| 9/1/1984 | LA | Fimple | Promoted to active roster | | | Before |
| 9/1/1984 | LA | Reyes | Promoted to active roster | | | Before |
| 9/1/1984 | LA | Reynolds | Promoted to active roster | | | Before |
| 9/1/1984 | LA | White | Promoted to active roster | | | Before |
| 9/1/1984 | Mil | Candiotti | Activated from disabled list | | | Before |
| 9/1/1984 | Mil | Gibson | Promoted to active roster | | | Before |
| 9/1/1984 | Mil | Hartzell | Promoted to active roster | | | Before |
| 9/1/1984 | Mil | Loman | Promoted to active roster | | | Before |
| 9/1/1984 | Mil | Sundberg | Activated from disabled list | | | Before |
| 9/1/1984 | Min | Brown | Promoted to active roster | | | Before |
| 9/1/1984 | Min | Reed | Promoted to active roster | | | Before |
| 9/1/1984 | Min | Williams | Activated from disabled list | | | Before |
| 9/1/1984 | Mon | Johnson,W | Promoted to active roster | | | Before |
| 9/1/1984 | Mon | Palmer | Activated from disabled list | | | Before |
| 9/1/1984 | Mon | Salazar | Promoted to active roster | | | Before |
| 9/1/1984 | NYN | Christensen | Promoted to active roster | | | Before |
| 9/1/1984 | NYN | Gardner | Promoted to active roster | | | Before |
| 9/1/1984 | NYN | Gibbons | Promoted to active roster | | | Before |
| 9/1/1984 | NYN | Mitchell | Promoted to active roster | | | Before |
| 9/1/1984 | NYN | Schiraldi | Promoted to active roster | | | Before |
| 9/1/1984 | NYN | Stearns | Activated from disabled list | | | Before |
| 9/1/1984 | NYN | Winningham | Promoted to active roster | | | Before |
| 9/1/1984 | Oak | Codiroli | Promoted to active roster | | | Before |
| 9/1/1984 | Oak | Jones | Activated from disabled list | | | Before |
| 9/1/1984 | Oak | Kiefer | Promoted to active roster | | | Before |
| 9/1/1984 | Oak | Langford | Activated from disabled list | | | Before |
| 9/1/1984 | Oak | Leiper | Promoted to active roster | | | Before |
| 9/1/1984 | Oak | Meyer | Promoted to active roster | | | Before |
| 9/1/1984 | Oak | Warren | Promoted to active roster | | | Before |
| 9/1/1984 | Phi | Fireovid | Promoted to active roster | | | Before |
| 9/1/1984 | Phi | Hudson | Activated from disabled list | | | Before |
| 9/1/1984 | Phi | Jeltz | Promoted to active roster | | | Before |
| 9/1/1984 | Phi | LaValliere | Promoted to active roster | | | Before |
| 9/1/1984 | Phi | Schu | Promoted to active roster | | | Before |
| 9/1/1984 | Phi | Stone | Promoted to active roster | | | Before |
| 9/1/1984 | Pit | Guante | Promoted to active roster | | | Before |
| 9/1/1984 | SD | Chiffer | Promoted to active roster | | | Before |
| 9/1/1984 | SD | DeLeon | Activated from disabled list | | | Before |
| 9/1/1984 | SD | Gwosdz | Promoted to active roster | | | Before |
| 9/1/1984 | SD | Miller | Promoted to active roster | | | Before |
| 9/1/1984 | SD | Roenicke | Promoted to active roster | | | Before |
| 9/1/1984 | Sea | Young | Promoted to active roster | | | Before |
| 9/1/1984 | SF | Brown | Promoted to active roster | | | Before |
| 9/1/1984 | SF | Calvert | Promoted to active roster | | | Before |
| 9/1/1984 | SF | Deer | Promoted to active roster | | | Before |
| 9/1/1984 | SF | Garrelts | Promoted to active roster | | | Before |
| 9/1/1984 | SF | Hammaker | Activated from disabled list | | | Before |
| 9/1/1984 | SF | O'Malley | Traded away | ChA | | Before |
| 9/1/1984 | SF | Riley | Promoted to active roster | | | Before |
| 9/1/1984 | SF | Sanchez | Promoted to active roster | | | Before |
| 9/1/1984 | Tex | Anderson | Promoted to active roster | | | Before |
| 9/1/1984 | Tex | Buckley | Promoted to active roster | | | Before |
| 9/1/1984 | Tex | Dunbar | Promoted to active roster | | | Before |
| 9/1/1984 | Tex | Henry | Promoted to active roster | | | Before |
| 9/1/1984 | Tex | Hostetler | Promoted to active roster | | | Before |
| 9/1/1984 | Tex | Wright,R | Promoted to active roster | | | Before |
| 9/1/1984 | Tor | Acker | Activated from disabled list | | | Before |
| 9/3/1984 | Hou | Richardt | Activated from disabled list | | | Before |
| 9/3/1984 | NYA | Bystrom | Activated from disabled list | | | Before |
| 9/3/1984 | NYA | Gamble | Activated from disabled list | | | Before |
| 9/3/1984 | NYA | Guidry | Activated from disabled list | | | Before |
| 9/3/1984 | Phi | Corcoran | Activated from disabled list | | | Before |
| 9/3/1984 | StL | Forsch | Activated from disabled list | | | Before |
| 9/3/1984 | Tex | Stein | Activated from disabled list | | | Before |
| 9/4/1984 | Atl | Bedrosian | Activated from disabled list | | | Before |
| 9/4/1984 | Atl | Harper | Promoted to active roster | | | Before |
| 9/4/1984 | Atl | Smith | Promoted to active roster | | | Before |
| 9/4/1984 | Atl | Thompson | Promoted to active roster | | | Before |
| 9/4/1984 | Atl | Zuvella | Promoted to active roster | | | Before |
| 9/4/1984 | Bal | Dixon | Promoted to active roster | | | Before |
| 9/4/1984 | Bal | Jackson | Promoted to active roster | | | Before |
| 9/4/1984 | Bal | Rodriguez | Promoted to active roster | | | Before |
| 9/4/1984 | Bal | Sheets | Promoted to active roster | | | Before |
| 9/4/1984 | Det | Brookens | Activated from disabled list | | | Before |
| 9/4/1984 | Det | Earl | Promoted to active roster | | | Before |
| 9/4/1984 | Det | Laga | Promoted to active roster | | | Before |
| 9/4/1984 | Det | Lowry | Promoted to active roster | | | Before |
| 9/4/1984 | Det | Mason | Promoted to active roster | | | Before |
| 9/4/1984 | Det | O'Neal | Promoted to active roster | | | Before |
| 9/4/1984 | Det | Simmons | Promoted to active roster | | | Before |
| 9/4/1984 | KC | Concepcion | Activated from disabled list | | | Before |
| 9/4/1984 | KC | Jackson | Promoted to active roster | | | Before |
| 9/4/1984 | KC | Leeper | Promoted to active roster | | | Before |
| 9/4/1984 | KC | Scranton | Promoted to active roster | | | Before |
| 9/4/1984 | Sea | Coles | Promoted to active roster | | | Before |
| 9/4/1984 | Sea | Stoddard | Promoted to active roster | | | Before |
| 9/4/1984 | Tor | Gruber | Promoted to active roster | | | Before |
| 9/4/1984 | Tor | Hernandez | Promoted to active roster | | | Before |
| 9/4/1984 | Tor | Manrique | Promoted to active roster | | | Before |
| 9/4/1984 | Tor | Shepherd | Promoted to active roster | | | Before |
| 9/4/1984 | Tor | Webster | Promoted to active roster | | | Before |
| 9/5/1984 | ChA | Christmas | Promoted to active roster | | | Before |
| 9/5/1984 | ChA | Niemann | Promoted to active roster | | | Before |
| 9/5/1984 | ChA | Skinner | Promoted to active roster | | | Before |
| 9/5/1984 | LA | Whitfield | Activated from disabled list | | | Before |
| 9/5/1984 | Mon | Breining | Activated from disabled list | | | Before |
| 9/5/1984 | Mon | Francona | Activated from disabled list | | | Before |
| 9/5/1984 | Oak | Tettleton | Promoted to active roster | | | Before |
| 9/5/1984 | SF | Clark | Activated from disabled list | | | Before |
| 9/5/1984 | SF | Nicosia | Activated from disabled list | | | Before |
| 9/6/1984 | Cal | Thomas | Acquired via trade | Mon | | Before |
| 9/6/1984 | Mon | Thomas | Traded away | Cal | | Before |
| 9/6/1984 | Sea | Best | Promoted to active roster | | | Before |
| 9/6/1984 | Sea | Chambers | Promoted to active roster | | | Before |
| 9/6/1984 | Sea | Guetterman | Promoted to active roster | | | Before |
| 9/6/1984 | Sea | Nahorodny | Promoted to active roster | | | Before |
| 9/6/1984 | Sea | Reynolds | Promoted to active roster | | | Before |
| 9/6/1984 | Sea | Tartabull | Promoted to active roster | | | Before |
| 9/6/1984 | Sea | Valle | Promoted to active roster | | | Before |
| 9/6/1984 | StL | Brummer | Activated from disabled list | | | Before |
| 9/7/1984 | Cin | Bilardello | Promoted to active roster | | | Before |
| 9/7/1984 | Cin | Browning | Promoted to active roster | | | Before |
| 9/7/1984 | Cin | Knicely | Promoted to active roster | | | Before |
| 9/7/1984 | Cin | Rowdon | Promoted to active roster | | | Before |
| 9/7/1984 | Cin | Toliver | Promoted to active roster | | | Before |
| 9/7/1984 | Min | Gagne | Promoted to active roster | | | Before |
| 9/7/1984 | Min | O'Connor | Promoted to active roster | | | Before |
| 9/7/1984 | Min | Speier | Activated from disabled list | | | Before |
| 9/8/1984 | NYN | Beane | Promoted to active roster | | | Before |
| 9/8/1984 | Pit | Bielecki | Promoted to active roster | | | Before |
| 9/8/1984 | Pit | Pulido | Promoted to active roster | | | Before |
| 9/9/1984 | ChN | Johnstone | Released | | | Before |
| 9/9/1984 | Cin | Householder | Traded away | StL | | Before |
| 9/9/1984 | NYA | Bradley | Promoted to active roster | | | Before |
| 9/9/1984 | NYA | Christiansen | Promoted to active roster | | | Before |
| 9/9/1984 | NYA | Hudler | Promoted to active roster | | | Before |
| 9/9/1984 | NYA | Robertson | Promoted to active roster | | | Before |
| 9/9/1984 | NYN | Santana | Activated from disabled list | | | Before |
| 9/9/1984 | StL | Householder | Acquired via trade | Cin | | Before |
| 9/10/1984 | Cal | Cliburn | Promoted to active roster | | | Before |
| 9/10/1984 | Cal | Smith | Promoted to active roster | | | Before |
| 9/10/1984 | Cal | Steirer | Promoted to active roster | | | Before |
| 9/10/1984 | NYN | Gardenhire | Activated from disabled list | | | Before |
| 9/11/1984 | Cal | Beniquez | Suspended | | | Before |
| 9/11/1984 | Cal | Sconiers | Suspended | | | Before |
| 9/11/1984 | LA | Bailor | Activated from disabled list | | | Before |
| 9/11/1984 | LA | Niedenfuer | Activated from disabled list | | | Before |
| 9/11/1984 | Mon | Bargar | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | Butera | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | Fuentes | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | Johnson,Roy | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | Lawless | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | Little | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | Shines | Promoted to active roster | | | Before |
| 9/11/1984 | Mon | St.Claire | Promoted to active roster | | | Before |
| 9/11/1984 | Pit | Mazzilli | Activated from disabled list | | | Before |
| 9/12/1984 | Sea | Calderon | Activated from disabled list | | | Before |
| 9/13/1984 | StL | Gonzalez | Promoted to active roster | | | Before |
| 9/13/1984 | StL | Smith,O | Suspended | | | Before |
| 9/14/1984 | Bos | Dorsey | Promoted to active roster | | | Before |
| 9/14/1984 | Bos | Gale | Promoted to active roster | | | Before |
| 9/14/1984 | Bos | Sullivan | Promoted to active roster | | | Before |
| 9/14/1984 | Cal | Beniquez | Reinstated | | | Before |
| 9/14/1984 | Cal | Sconiers | Reinstated | | | Before |
| 9/14/1984 | Cle | Barkley | Promoted to active roster | | | Before |
| 9/14/1984 | Cle | Romero | Promoted to active roster | | | Before |
| 9/14/1984 | Cle | Ujdur | Promoted to active roster | | | Before |
| 9/14/1984 | LA | Miller | Promoted to active roster | | | Before |
| 9/14/1984 | Oak | Burgmeier | Placed on disabled list | | 9/14/1984 | Before |
| 9/14/1984 | Pit | Berra | Activated from disabled list | | | Before |
| 9/15/1984 | ChA | Spillner | Placed on disabled list | | 9/15/1984 | Before |
| 9/15/1984 | LA | Yeager | Placed on disabled list | | 9/15/1984 | Before |
| 9/16/1984 | Mil | Kern | Promoted to active roster | | | Before |
| 9/16/1984 | StL | Citarella | Promoted to active roster | | | Before |
| 9/16/1984 | StL | Hagen | Promoted to active roster | | | Before |
| 9/16/1984 | StL | Hassler | Promoted to active roster | | | Before |
| 9/16/1984 | StL | Herr | Placed on disabled list | | 9/16/1984 | Before |
| 9/16/1984 | StL | Ownbey | Promoted to active roster | | | Before |
| 9/16/1984 | StL | Smith,O | Reinstated | | | Before |
| 9/17/1984 | Bal | Ford | Activated from disabled list | | | Before |
| 9/19/1984 | Bal | Snell | Promoted to active roster | | | Before |
| 9/19/1984 | Bal | Traber | Promoted to active roster | | | Before |
| 9/19/1984 | NYA | Rasmussen | Suspended | | | Before |
| 9/19/1984 | Tor | Upshaw | Suspended | | | Before |
| 9/22/1984 | NYA | Rasmussen | Reinstated | | | Before |
| 9/22/1984 | Tor | Upshaw | Reinstated | | | Before |
| 9/24/1984 | ChA | Quirk | Traded away | Cle | | Before |
| 9/24/1984 | Cle | Quirk | Acquired via trade | ChA | | Before |
| 9/25/1984 | KC | Washington | Activated from disabled list | | | Before |
| 9/30/1984 | NYN | Martin | Released | | | Before |