Nationals Roster & Staff
Transactions
| Date | Transaction |
| 12/31/25 | Washington Nationals signed free agent 1B Matt Mervis to a minor league contract. |
| 12/27/25 | Washington Nationals signed free agent SS Kervin Pichardo to a minor league contract. |
| 12/23/25 | RF Daylen Lile changed number to 4. |
| 12/23/25 | 3B Brady House changed number to 12. |
| 12/23/25 | RHP Jackson Rutledge changed number to 44. |
| 12/23/25 | RHP Brad Lord changed number to 41. |
| 12/22/25 | Washington Nationals signed free agent LHP Foster Griffin. |
| 12/20/25 | Washington Nationals signed free agent 3B Warming Bernabel to a minor league contract. |
| 12/15/25 | Boston Red Sox traded RHP Luis Perales to Washington Nationals for LHP Jake Bennett. |
| 12/15/25 | Boston Red Sox traded RHP Luis Perales to Washington Nationals for LHP Jake Bennett. |
| 12/10/25 | RHP Brady Hill roster status changed by Washington Nationals. |
| 12/10/25 | RHP Brady Hill roster status changed by Washington Nationals. |
| 12/10/25 | RHP Eiker Huizi roster status changed by Washington Nationals. |
| 12/10/25 | Washington Nationals purchased contract of RHP Sandy Gaston in the Rule 5 Draft, AAA Phase. |
| 12/10/25 | Washington Nationals purchased contract of RHP Brady Hill in the Rule 5 Draft, AAA Phase. |
| 12/10/25 | Washington Nationals purchased contract of RHP Cesar Rojas in the Rule 5 Draft, AAA Phase. |
| 12/10/25 | Washington Nationals purchased contract of RHP Griff McGarry in the Rule 5 Draft. |
| 12/10/25 | Washington Nationals purchased contract of LF Jack Rogers in the Rule 5 Draft, AAA Phase. |
| 12/10/25 | Washington Nationals purchased contract of RHP Dylan Tebrake in the Rule 5 Draft, AAA Phase. |
| 12/10/25 | Washington Nationals purchased contract of RHP Eiker Huizi in the Rule 5 Draft, AAA Phase. |
| 12/08/25 | Washington Nationals signed free agent RHP Amin Ramirez to a minor league contract. |
| 12/06/25 | RHP Isaac Lyon roster status changed by Washington Nationals. |
| 12/06/25 | RHP Isaac Lyon roster status changed by Washington Nationals. |
| 12/06/25 | Washington Nationals traded LHP Jose A. Ferrer to Seattle Mariners for C Harry Ford and RHP Isaac Lyon. |
| 12/06/25 | Washington Nationals traded LHP Jose A. Ferrer to Seattle Mariners for C Harry Ford and RHP Isaac Lyon. |
| 12/06/25 | Washington Nationals traded LHP Jose A. Ferrer to Seattle Mariners for C Harry Ford and RHP Isaac Lyon. |