Nationals Roster & Staff
Transactions
| Date | Transaction |
| 05/19/26 | Washington Nationals optioned 3B Brady House to Rochester Red Wings. |
| 05/19/26 | Washington Nationals optioned RF Joey Wiemer to Rochester Red Wings. |
| 05/19/26 | Washington Nationals recalled 1B Andrés Chaparro from Rochester Red Wings. |
| 05/19/26 | Washington Nationals recalled RF Dylan Crews from Rochester Red Wings. |
| 05/17/26 | Washington Nationals sent RHP Cole Henry on a rehab assignment to Rochester Red Wings. |
| 05/16/26 | Washington Nationals sent RHP Clayton Beeter on a rehab assignment to Rochester Red Wings. |
| 05/15/26 | Washington Nationals optioned RHP Zak Kent to Rochester Red Wings. |
| 05/15/26 | Washington Nationals recalled LHP Andrew Alvarez from Rochester Red Wings. |
| 05/14/26 | Washington Nationals sent RHP Cole Henry on a rehab assignment to FCL Nationals. |
| 05/13/26 | Washington Nationals signed free agent LHP Alex Young to a minor league contract. |
| 05/13/26 | Washington Nationals sent RHP Clayton Beeter on a rehab assignment to FCL Nationals. |
| 05/13/26 | Washington Nationals sent RHP Clayton Beeter on a rehab assignment to FCL Nationals. |
| 05/10/26 | Philadelphia Phillies claimed RHP Jackson Rutledge off waivers from Washington Nationals. |
| 05/06/26 | Washington Nationals optioned RHP Andre Granillo to Rochester Red Wings. |
| 05/06/26 | Washington Nationals recalled RHP Zak Kent from Rochester Red Wings. |
| 05/05/26 | Washington Nationals designated RHP Jackson Rutledge for assignment. |
| 05/05/26 | Washington Nationals signed free agent RHP Max Kranick. Right elbow surgery recovery. |
| 05/04/26 | Washington Nationals signed free agent RHP Colby Frieda to a minor league contract. |
| 05/04/26 | Washington Nationals signed free agent RHP Baron Stuart to a minor league contract. |
| 05/03/26 | Washington Nationals optioned RHP Zak Kent to Rochester Red Wings. |
| 05/03/26 | Washington Nationals claimed RHP Zak Kent off waivers from Minnesota Twins. |
| 05/02/26 | Washington Nationals signed free agent RHP Aaron Shortridge to a minor league contract. |
| 05/02/26 | Washington Nationals sent LHP Cionel Pérez outright to Rochester Red Wings. |
| 05/02/26 | Washington Nationals recalled RHP Orlando Ribalta from Rochester Red Wings. |
| 05/01/26 | Washington Nationals signed free agent RHP Shawn Dubin to a minor league contract. |
| 05/01/26 | Washington Nationals traded 3B Zack Short to Detroit Tigers for cash. |