D-backs Roster & Staff
Transactions
| Date | Transaction |
| 12/31/19 | Arizona Diamondbacks signed free agent C Michael De La Cruz to a minor league contract. |
| 12/30/19 | Arizona Diamondbacks signed free agent RF Kole Calhoun. |
| 12/19/19 | Andrew Chafin changed number to 47. |
| 12/18/19 | Arizona Diamondbacks signed free agent 3B Luis Jimenez to a minor league contract. |
| 12/17/19 | Arizona Diamondbacks signed free agent LHP Madison Bumgarner. |
| 12/13/19 | Arizona Diamondbacks signed free agent RHP Luis Osorio to a minor league contract. |
| 12/13/19 | Arizona Diamondbacks signed free agent RHP Kelly Reyes to a minor league contract. |
| 12/12/19 | Arizona Diamondbacks signed free agent LHP Kyle Crockett to a minor league contract. |
| 12/12/19 | Arizona Diamondbacks signed free agent RHP Eduardo Jimenez to a minor league contract and invited him to spring training. |
| 12/09/19 | Arizona Diamondbacks signed free agent RHP Junior Guerra. |
| 12/02/19 | RHP Taijuan Walker elected free agency. |
| 12/02/19 | C Caleb Joseph elected free agency. |
| 12/02/19 | RF Steven Souza Jr. elected free agency. |