D-backs Roster & Staff
Transactions
| Date | Transaction |
| 12/30/18 | Cincinnati Reds traded LHP Robby Scott to Arizona Diamondbacks for cash. |
| 12/20/18 | Arizona Diamondbacks signed free agent RHP Ryan Newell to a minor league contract and invited him to spring training. |
| 12/17/18 | Arizona Diamondbacks signed free agent 2B Jose Marcano to a minor league contract. |
| 12/17/18 | Arizona Diamondbacks signed free agent RHP Andreuris Meran to a minor league contract. |
| 12/14/18 | Arizona Diamondbacks signed free agent RHP Jaron Long to a minor league contract and invited him to spring training. |
| 12/14/18 | Arizona Diamondbacks signed free agent CF Matt Szczur to a minor league contract and invited him to spring training. |
| 12/14/18 | Arizona Diamondbacks signed free agent RHP Gustavo Del Pozo to a minor league contract. |
| 12/13/18 | Arizona Diamondbacks signed free agent RHP Vinny Nittoli to a minor league contract and invited him to spring training. |
| 12/13/18 | Arizona Diamondbacks claimed RHP Nick Green off waivers from Trenton Thunder. |
| 12/05/18 | Arizona Diamondbacks traded 1B Paul Goldschmidt to St. Louis Cardinals for C Carson Kelly, RHP Luke Weaver, 2B Andy Young and Future Considerations. |
| 12/05/18 | Arizona Diamondbacks traded 1B Paul Goldschmidt to St. Louis Cardinals for C Carson Kelly, RHP Luke Weaver, 2B Andy Young and Future Considerations. |
| 12/05/18 | Arizona Diamondbacks traded 1B Paul Goldschmidt to St. Louis Cardinals for C Carson Kelly, RHP Luke Weaver, 2B Andy Young and Future Considerations. |
| 12/05/18 | Arizona Diamondbacks traded 1B Paul Goldschmidt to St. Louis Cardinals for C Carson Kelly, RHP Luke Weaver, 2B Andy Young and Future Considerations. |
| 12/04/18 | Arizona Diamondbacks signed free agent RHP Merrill Kelly. |