Reds Roster & Staff
Transactions
| Date | Transaction |
| 01/30/18 | Cincinnati Reds signed free agent RHP David Hernandez. |
| 01/22/18 | Cincinnati Reds signed free agent OF C.J. McElroy to a minor league contract. |
| 01/22/18 | Cincinnati Reds invited non-roster 3B Nick Senzel to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster C Joe Hudson to spring training. |
| 01/22/18 | Aristides Aquino changed number to . |
| 01/22/18 | Cincinnati Reds invited non-roster RHP Rafael De Paula to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster RHP Jimmy Herget to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster LF Darnell Sweeney to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster RF Sebastian Elizalde to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster 2B Brandon Dixon to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster C Chadwick Tromp to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster RHP Tanner Rainey to spring training. |
| 01/22/18 | Cincinnati Reds invited non-roster RHP Barrett Astin to spring training. |
| 01/19/18 | Cincinnati Reds invited non-roster RHP Domingo Tapia to spring training. |
| 01/18/18 | Cincinnati Reds signed free agent OF Rafael Franco to a minor league contract. |
| 01/11/18 | Cincinnati Reds signed free agent C Jose Duarte to a minor league contract. |
| 01/09/18 | Cincinnati Reds signed free agent RHP Vance Worley to a minor league contract and invited him to spring training. |
| 01/08/18 | Cincinnati Reds signed free agent RHP Dylan Floro to a minor league contract and invited him to spring training. |
| 01/06/18 | Cincinnati Reds signed free agent C Daniel Vellojin to a minor league contract. |
| 01/03/18 | Scooter Gennett changed number to 3. |