Nationals Roster & Staff
Transactions
| Date | Transaction |
| 09/10/26 | Washington Nationals placed 2B Nasim Nuñez on the bereavement list. |
| 09/10/26 | Washington Nationals recalled LF Andrew Pinckney from Rochester Red Wings. |
| 09/09/26 | Washington Nationals sent RHP Josiah Gray on a rehab assignment to Rochester Red Wings. |
| 09/09/26 | Washington Nationals optioned RHP Zak Kent to Rochester Red Wings. |
| 09/09/26 | Washington Nationals recalled RHP Eddy Yean from Rochester Red Wings. |
| 09/08/26 | Washington Nationals placed RHP Matt Waldron on the 15-day injured list retroactive to September 5, 2026. Chest inflammation. |
| 09/08/26 | Washington Nationals recalled RHP Zak Kent from Rochester Red Wings. |
| 09/07/26 | Washington Nationals placed RHP Orlando Ribalta on the 15-day injured list retroactive to September 4, 2026. Right forearm inflammation. |
| 09/07/26 | Washington Nationals recalled RHP Yovanny Cruz from Rochester Red Wings. |
| 09/06/26 | Washington Nationals sent RHP Max Kranick outright to Rochester Red Wings. |
| 09/05/26 | Washington Nationals sent LHP Richard Lovelady on a rehab assignment to Rochester Red Wings. |
| 09/04/26 | Washington Nationals designated RHP Max Kranick for assignment. |
| 09/04/26 | Washington Nationals selected the contract of RHP Jack Sinclair from Rochester Red Wings. |
| 09/04/26 | Washington Nationals sent LHP Tom Cosgrove outright to Rochester Red Wings. |
| 09/03/26 | Washington Nationals sent LHP Richard Lovelady on a rehab assignment to Harrisburg Senators. |
| 09/02/26 | Washington Nationals signed free agent 3B Buddy Kennedy to a minor league contract. |
| 09/02/26 | Washington Nationals sent RHP Josiah Gray on a rehab assignment to Harrisburg Senators. |
| 09/02/26 | Washington Nationals designated LHP Tom Cosgrove for assignment. |
| 09/02/26 | Washington Nationals sent RHP Josiah Gray on a rehab assignment to Harrisburg Senators. |
| 09/02/26 | Washington Nationals activated RF James Wood from the 10-day injured list. |
| 09/02/26 | Washington Nationals recalled RHP Riley Cornelio from Rochester Red Wings. |
| 09/02/26 | Washington Nationals optioned LF Andrew Pinckney to Rochester Red Wings. |
| 09/01/26 | Washington Nationals sent LHP Richard Lovelady on a rehab assignment to Fredericksburg Nationals. |
| 09/01/26 | Washington Nationals transferred C Drew Millas from the 10-day injured list to the 60-day injured list. Left index finger fracture. |
| 09/01/26 | Washington Nationals selected the contract of 1B Yohandy Morales from Rochester Red Wings. |
| 09/01/26 | Washington Nationals selected the contract of LHP Jared Simpson from Rochester Red Wings. |