Reds Roster & Staff
Transactions
| Date | Transaction |
| 10/29/18 | RHP Matt Harvey elected free agency. |
| 10/21/18 | Cody Reed changed number to . |
| 10/16/18 | Cincinnati Reds signed free agent RHP Williams Yanez to a minor league contract. |
| 10/16/18 | Cincinnati Reds signed free agent RHP Gabriel Aguilera to a minor league contract. |
| 10/16/18 | Cincinnati Reds signed free agent RHP Jose Franco to a minor league contract. |
| 10/10/18 | Cincinnati Reds claimed C Juan Graterol off waivers from Minnesota Twins. |
| 10/06/18 | Miami Marlins traded RHP Ryan Lillie to Cincinnati Reds for Future Considerations. |
| 10/03/18 | Cincinnati Reds sent RF Gabriel Guerrero outright to Louisville Bats. |
| 10/03/18 | Cincinnati Reds sent C Tim Federowicz outright to Louisville Bats. |
| 10/01/18 | Cincinnati Reds activated RHP Robert Stephenson from the 10-day injured list. |
| 10/01/18 | Cincinnati Reds recalled Brandon Finnegan from Louisville Bats. |
| 10/01/18 | Cincinnati Reds recalled 2B Shed Long from Chattanooga Lookouts. |
| 10/01/18 | Cincinnati Reds recalled RHP Austin Brice from Louisville Bats. |
| 10/01/18 | Cincinnati Reds recalled RHP Jose Lopez from Louisville Bats. |
| 10/01/18 | Cincinnati Reds recalled RHP Tanner Rainey from Louisville Bats. |
| 10/01/18 | Cincinnati Reds recalled RF Aristides Aquino from Chattanooga Lookouts. |
| 10/01/18 | Cincinnati Reds recalled Jose Siri from Chattanooga Lookouts. |