SPB In Season Free Agency -- Seasons Past Baseball
Regular season
| Transactions |
| Seq | Date | Team | Player | Type |
| 0 | 4/16/1957 | SOU | Lumenti | Released |
| 0 | 4/16/1957 | SOU | Smalley | Signed |
| 0 | 4/29/1957 | SOU | Jackson,Ro | Released |
| 0 | 4/29/1957 | SOU | Kennedy,Bo | Signed |
| 0 | 4/29/1957 | SOU | Malkmus | Signed |
| 0 | 4/29/1957 | SOU | Wiesler | Released |
| 0 | 5/25/1957 | HOO | Byrne | Signed |
| 0 | 5/25/1957 | HOO | Jackson,Ra | Released |
| 0 | 5/25/1957 | IND | Byrne | Released |
| 0 | 5/25/1957 | IND | Mayer | Signed |
| 0 | 6/1/1957 | EKL | Fanning | Released |
| 0 | 6/1/1957 | EKL | Northey,R | Signed |
| 0 | 8/1/1957 | EKL | Jackson,Ra | Signed |
| 0 | 8/1/1957 | EKL | Margoneri | Released |
| 0 | 8/6/1957 | KCB | Caffie | Released |
| 0 | 8/6/1957 | KCB | Fanning | Signed |
| 0 | 8/7/1957 | KCB | Caffie | Released |
| 0 | 8/7/1957 | KCB | Caffie | Signed |
| 0 | 8/7/1957 | KCB | Fanning | Released |
| 0 | 8/7/1957 | KCB | Fanning | Signed |
| 0 | 8/13/1957 | HOO | Jackson,Ro | Signed |
| 0 | 8/13/1957 | HOO | Thompson | Released |
| 0 | 8/18/1957 | HOO | Byrne | Released |
| 0 | 8/18/1957 | HOO | Caffie | Signed |