| Tm | Name | W | L | Start | End | |
|---|---|---|---|---|---|---|
| ANA | Doug Rader | 80 | 82 | Beg | End | |
| ATL | Russ Nixon | 25 | 40 | Beg | 19900621 | |
| ATL | Bobby Cox | 40 | 57 | 19900623 | End | |
| BAL | Frank Robinson | 76 | 85 | Beg | End | |
| BOS | Joe Morgan | 88 | 74 | Beg | End | |
| CHA | Jeff Torborg | 94 | 68 | Beg | End | |
| CHN | Don Zimmer | 77 | 85 | Beg | End | |
| CIN | Lou Piniella | 91 | 71 | Beg | End | |
| CLE | John McNamara | 77 | 85 | Beg | End | |
| DET | Sparky Anderson | 79 | 83 | Beg | End | |
| HOU | Art Howe | 75 | 87 | Beg | End | |
| KCA | John Wathan | 75 | 86 | Beg | End | |
| LAN | Tom Lasorda | 86 | 76 | Beg | End | |
| MIL | Tom Trebelhorn | 34 | 42 | Beg | 19900704 | |
| MIL | Don Baylor | 3 | 2 | 19900705 | 19900711 | |
| MIL | Tom Trebelhorn | 37 | 44 | 19900712 | End | |
| MIN | Tom Kelly | 74 | 88 | Beg | End | |
| NYA | Bucky Dent | 18 | 31 | Beg | 19900605 | |
| NYA | Stump Merrill | 49 | 64 | 19900606 | End | |
| NYN | Davey Johnson | 20 | 22 | Beg | 19900527 | |
| NYN | Bud Harrelson | 71 | 49 | 19900529 | End | |
| OAK | Tony LaRussa | 103 | 59 | Beg | End | |
| PHI | Nick Leyva | 77 | 85 | Beg | End | |
| PIT | Jim Leyland | 95 | 67 | Beg | End | |
| SDN | Jack McKeon | 37 | 43 | Beg | 19900708 | |
| SDN | Greg Riddoch | 38 | 44 | 19900712 | End | |
| SEA | Jim Lefebvre | 77 | 85 | Beg | End | |
| SFN | Roger Craig | 85 | 77 | Beg | End | |
| SLN | Whitey Herzog | 33 | 47 | Beg | 19900705 | |
| SLN | Red Schoendienst | 13 | 11 | 19900706 | 19900801 | |
| SLN | Joe Torre | 24 | 34 | 19900802 | End | |
| TEX | Bobby Valentine | 83 | 79 | Beg | End | |
| TOR | Cito Gaston | 86 | 76 | Beg | End | |
| WAS | Buck Rodgers | 85 | 77 | Beg | End |
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