Nationals Roster & Staff
Transactions
| Date | Transaction |
| 06/17/26 | Washington Nationals released RHP Julian Fernández. |
| 06/16/26 | Washington Nationals sent LHP DJ Herz on a rehab assignment to Fredericksburg Nationals. |
| 06/13/26 | Washington Nationals optioned RHP Riley Cornelio to Rochester Red Wings. |
| 06/13/26 | Washington Nationals recalled LHP PJ Poulin from Rochester Red Wings. |
| 06/12/26 | Washington Nationals designated RHP Julian Fernández for assignment. |
| 06/12/26 | Washington Nationals optioned RHP Jhancarlos Lara to Harrisburg Senators. |
| 06/12/26 | Washington Nationals claimed RHP Jhancarlos Lara off waivers from Atlanta Braves. |
| 06/08/26 | Washington Nationals acquired RHP Brock Gillis from the Yuba-Sutter Freebirds of the Pioneer League. |
| 06/07/26 | Washington Nationals optioned RHP Cole Henry to Rochester Red Wings. |
| 06/07/26 | Washington Nationals recalled RHP Riley Cornelio from Rochester Red Wings. |
| 06/07/26 | Washington Nationals optioned RHP Cole Henry to Rochester Red Wings. |
| 06/05/26 | Washington Nationals signed free agent RHP Ike Buxton to a minor league contract. |
| 06/05/26 | Washington Nationals sent LHP DJ Herz on a rehab assignment to FCL Nationals. |
| 06/05/26 | Washington Nationals sent LHP DJ Herz on a rehab assignment to FCL Nationals. |
| 06/03/26 | Washington Nationals signed free agent RHP Sam Brodersen to a minor league contract. |
| 06/03/26 | Washington Nationals signed free agent RHP Darling Reyes to a minor league contract. |