| Tm | Name | W | L | Start | End | |
|---|---|---|---|---|---|---|
| BOS | Al Buckenberger | 55 | 98 | Beg | End | |
| BOS | Jimmy Collins | 95 | 59 | Beg | End | |
| CHA | Nixey Callahan | 23 | 18 | Beg | 19040605 | |
| CHA | Fielder Jones | 66 | 47 | 19040606 | End | |
| CHN | Frank Selee | 93 | 60 | Beg | End | |
| CIN | Joe Kelley | 88 | 65 | Beg | End | |
| CLE | Bill Armour | 86 | 65 | Beg | End | |
| DET | Ed Barrow | 32 | 46 | Beg | 19040723 | |
| DET | Bobby Lowe | 30 | 44 | 19040726 | End | |
| LAN | Ned Hanlon | 56 | 97 | Beg | End | |
| NYA | Clark Griffith | 92 | 59 | Beg | End | |
| OAK | Connie Mack | 81 | 70 | Beg | End | |
| PHI | Hugh Duffy | 52 | 100 | Beg | End | |
| PIT | Fred Clarke | 87 | 66 | Beg | End | |
| SFN | John McGraw | 106 | 47 | Beg | End | |
| SLN | Jimmy McAleer | 65 | 87 | Beg | End | |
| SLN | Kid Nichols | 75 | 79 | Beg | End | |
| TEX | Malachi Kittridge | 1 | 16 | Beg | 19040509 | |
| TEX | Patsy Donovan | 37 | 97 | 19040511 | End |
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