| | 投手 | Placed on 60-Day IL (The Washington Nationals placed RHP Stephen Strasburg on the 60-day injured list.) |
| | 左外野手 | Placed on 10-Day IL (The Washington Nationals placed OF Stone Garrett on the 10-day injured list.) |
| | 一壘手 | Released (The Washington Nationals released INF Lewin Díaz.) |
| | 投手 | Signed (The Washington Nationals signed RHP T.J. Zeuch to a minor league contract.) |
| | 三壘手 | Sent to Minors (The Washington Nationals sent INF Trey Lipscomb to the minors.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Derek Law from the minors.) |
| | 投手 | Placed on 60-Day IL (The Washington Nationals placed RHP Cade Cavalli on the 60-day injured list.) |
| | 投手 | Placed on 60-Day IL (The Washington Nationals placed LHP Jose A. Ferrer on the 60-day injured list.) |
| | 投手 | Released (The Washington Nationals released RHP Zach Davies.) |
| | 投手 | Placed on 60-Day IL (The Washington Nationals placed RHP Mason Thompson on the 60-day injured list.) |
| | 中外野手 | Sent to Minors (The Washington Nationals sent OF Robert Hassell to the minors.) |
| | 捕手 | Sent to Minors (The Washington Nationals sent C Israel Pineda to the minors.) |
| | 中外野手 | Sent to Minors (The Washington Nationals sent OF Dylan Crews to the minors.) |
| | 左外野手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of OF Jesse Winker.) |
| | 右外野手 | Sent to Minors (The Washington Nationals sent OF James Wood to the minors.) |
| | 左外野手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of OF Eddie Rosario from the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals sent LHP Joe La Sorsa to the minors.) |
| | 投手 | Released (The Washington Nationals released RHP Luis Perdomo.) |
| | 投手 | Sent to Minors (The Washington Nationals sent LHP Richard Bleier to the minors.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Matt Barnes from the minors.) |
| | 左外野手 | Sent to Minors (The Washington Nationals sent OF Juan Yepez to the minors.) |
| | 游擊手 | Sent to Minors (The Washington Nationals sent INF Brady House to the minors.) |
| | 左外野手 | Sent to Minors (The Washington Nationals optioned OF Jacob Young to the minors.) |
| | 捕手 | Sent to Minors (The Washington Nationals optioned C Drew Millas to the minors.) |
| | 中外野手 | Sent to Minors (The Washington Nationals optioned OF Alex Call to the minors.) |
| | 二壘手 | Sent to Minors (The Washington Nationals sent INF Darren Baker to the minors.) |
| | 一壘手 | Sent to Minors (The Washington Nationals sent INF Lewin Díaz to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals sent RHP Luis Perdomo to the minors.) |
| | 捕手 | Sent to Minors (The Washington Nationals sent C Brady Lindsly to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals sent RHP Robert Gsellman to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Jackson Rutledge to the minors.) |
| | 三壘手 | Sent to Minors (The Washington Nationals sent INF Carter Kieboom outright to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Zach Brzykcy to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Thaddeus Ward to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned LHP DJ Herz to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Amos Willingham to the minors.) |
| | 三壘手 | Sent to Minors (The Washington Nationals optioned OF Jake Alu to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned LHP Mitchell Parker to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Cole Henry to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Joan Adon to the minors.) |
| | 左外野手 | Signed (The Washington Nationals signed OF Eddie Rosario.) |
| | 投手 | Signed (The Washington Nationals signed RHP Matt Barnes to a minor league contract.) |
| | 投手 | Signed (The Washington Nationals signed RHP Matt Barnes to a minor league contract.) |
| | 投手 | Non-roster Invitee (The Washington Nationals signed RHP Derek Law to a minor league contract with an invitation to spring training.) |
| | 投手 | Signed (The Washington Nationals signed RHP Jacob Barnes to a minor league contract.) |
| | 左外野手 | Non-roster Invitee (The Washington Nationals signed DH Jesse Winker to a minor league contract with an invitation to spring training.) |
| | 投手 | Non-roster Invitee (The Washington Nationals invited RHP Luis Perdomo to spring training.) |
| | 投手 | Signed (The Washington Nationals signed RHP Luis Perdomo to a minor league contract.) |
| | 投手 | Signed (The Washington Nationals signed RHP Luis Perdomo to a minor league contract.) |
| | 投手 | Signed (The Washington Nationals signed RHP Luke Farrell to a minor league contract.) |
| | 投手 | Non-roster Invitee (The Washington Nationals invited RHP Luke Farrell to spring training.) |
| | 投手 | Signed (The Washington Nationals signed RHP Luke Farrell to a minor league contract.) |
| | 投手 | Non-roster Invitee (The Washington Nationals signed RHP Stephen Nogosek to a minor league contract with an invitation to spring training.) |
| | 投手 | Signed (The Washington Nationals signed RHP Adonis Medina to a minor league contract.) |
| | 捕手 | Sent to Minors (The Washington Nationals outrighted C Israel Pineda to the minors.) |
| | 投手 | Non-roster Invitee (The Washington Nationals invited non-roster RHP Robert Gsellman to spring training.) |
| | 投手 | Signed (The Washington Nationals signed LHP Richard Bleier to a minor league contract.) |
| | 投手 | Signed (The Washington Nationals signed LHP Richard Bleier to a minor league contract.) |
| | 投手 | Signed (The Washington Nationals signed RHP Robert Gsellman to a minor league contract.) |
| | 投手 | Signed (The Washington Nationals signed RHP Robert Gsellman to a minor league contract.) |
| | 二壘手 | Non-roster Invitee (The Washington Nationals invited INF Darren Baker to spring training.) |
| | 捕手 | Non-roster Invitee (The Washington Nationals invited C Brady Lindsly to spring training.) |
| | 游擊手 | Non-roster Invitee (The Washington Nationals invited INF Brady House to spring training.) |
| | 中外野手 | Non-roster Invitee (The Washington Nationals invited OF Dylan Crews to spring training.) |
| | 投手 | Non-roster Invitee (The Washington Nationals invited LHP Joe La Sorsa to spring training.) |
| | 中外野手 | Non-roster Invitee (The Washington Nationals invited OF Robert Hassell III to spring training.) |
| | 三壘手 | Non-roster Invitee (The Washington Nationals invited INF Trey Lipscomb to spring training.) |
| | 左外野手 | Non-roster Invitee (The Washington Nationals invited OF Juan Yepez to spring training.) |
| | 右外野手 | Non-roster Invitee (The Washington Nationals invited OF James Wood to spring training.) |
| | 捕手 | Designated for Assignment (The Washington Nationals designated C Israel Pineda for assignment.) |
| | 左外野手 | Signed (The Washington Nationals signed OF Joey Gallo.) |
| | 二壘手 | Non-roster Invitee (The Washington Nationals signed INF Travis Blankenhorn to a minor league contract with an invitation to spring training.) |
| | 三壘手 | Signed (The Washington Nationals signed INF Nick Senzel.) |
| | 投手 | Drafted Via Rule 5 (The Washington Nationals selected RHP Samuel Vasquez in the Rule 5 Draft.) |
| | 左外野手 | Signed (The Washington Nationals signed OF Juan Yepez to a minor league contract.) |
| | 游擊手 | Drafted Via Rule 5 (The Washington Nationals selected INF Nasim Nunez in the Rule 5 Draft.) |
| | 投手 | Drafted Via Rule 5 (The Washington Nationals selected RHP Daison Acosta in the Rule 5 Draft.) |
| | 投手 | Sent to Minors (The Washington Nationals sent LHP Joe La Sorsa outright to the minors.) |
| | 右外野手 | Signed (The Washington Nationals signed OF Jordan Qsar to a minor league contract.) |
| | 投手 | Designated for Assignment (The Washington Nationals designated RHP Roddery Muñoz for assignment.) |
| | 投手 | Designated for Assignment (The Washington Nationals designated LHP Joe La Sorsa for assignment.) |
| | 一壘手 | Released (The Washington Nationals released INF Dominic Smith.) |
| | 投手 | Released (The Washington Nationals released RHP Cory Abbott.) |
| | 投手 | Designated for Assignment (The Washington Nationals designated RHP Cory Abbott for assignment.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Zach Brzykcy.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of LHP DJ Herz.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Cole Henry.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of LHP Mitchell Parker.) |
| | 一壘手 | Designated for Assignment (The Washington Nationals designated INF Dominic Smith for assignment.) |
| | 投手 | Released (The Washington Nationals released RHP Andrés Machado.) |
| | 中外野手 | Sent to Minors (The Washington Nationals sent OF Jeremy De La Rosa outright to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals sent LHP Matt Cronin outright to the minors.) |
| | 中外野手 | Designated for Assignment (The Washington Nationals designated OF Jeremy De La Rosa for assignment.) |
| | 投手 | Declared Free Agency (RHP Malvin Pena declared free agency.) |
| | 投手 | Declared Free Agency (RHP Hobie Harris declared free agency.) |
| | 投手 | Declared Free Agency (RHP Patrick Ruotolo declared free agency.) |
| | 右外野手 | Declared Free Agency (OF Donovan Casey declared free agency.) |
| | 左外野手 | Declared Free Agency (OF Yasel Antuna declared free agency.) |
| | 投手 | Declared Free Agency (RHP Junior Fernández declared free agency.) |
| | 游擊手 | Declared Free Agency (INF Jose Sanchez declared free agency.) |
| | 投手 | Declared Free Agency (RHP Tommy Romero declared free agency.) |
| | 投手 | Declared Free Agency (RHP Gerardo Carrillo declared free agency.) |
| | 投手 | Declared Free Agency (RHP Daniel Mengden declared free agency.) |
| | 投手 | Declared Free Agency (LHP Alex Troop declared free agency.) |
| | 右外野手 | Declared Free Agency (OF Frankie Tostado declared free agency.) |
| | 二壘手 | Declared Free Agency (INF Richie Martin declared free agency.) |
| | 投手 | Declared Free Agency (RHP Jackson Tetreault declared free agency.) |
| | 投手 | Declared Free Agency (RHP Gerson Moreno declared free agency.) |
| | 投手 | Declared Free Agency (RHP Ronald Herrera declared free agency.) |
| | 一壘手 | Declared Free Agency (INF Matt Adams declared free agency.) |
| | 游擊手 | Declared Free Agency (INF Nick Shumpert declared free agency.) |
| | 投手 | Declared Free Agency (RHP Matt Merrill declared free agency.) |
| | 投手 | Declared Free Agency (RHP Nash Walters declared free agency.) |
| | 三壘手 | Declared Free Agency (INF Jake Noll declared free agency.) |
| | 投手 | Declared Free Agency (RHP Odalvi Javier declared free agency.) |
| | 投手 | Designated for Assignment (The Washington Nationals designated LHP Matt Cronin for assignment.) |
| | 左外野手 | Activated (The Washington Nationals activated OF Stone Garrett.) |
| | 投手 | Activated (The Washington Nationals activated RHP Stephen Strasburg.) |
| | 投手 | Activated (The Washington Nationals activated RHP Cade Cavalli.) |
| | 中外野手 | Activated (The Washington Nationals activated OF Victor Robles.) |
| | 捕手 | Activated (The Washington Nationals activated C Riley Adams.) |
| | 游擊手 | Activated (The Washington Nationals activated INF Jeter Downs.) |
| | 中外野手 | Activated (The Washington Nationals activated OF Jeremy De La Rosa.) |
| | 投手 | Activated (The Washington Nationals activated RHP Robert Garcia.) |
| | 捕手 | Activated (The Washington Nationals activated C Israel Pineda.) |
| | 投手 | Activated (The Washington Nationals activated RHP Roddery Muñoz.) |
| | 投手 | Activated (The Washington Nationals activated LHP MacKenzie Gore.) |
| | 投手 | Activated (The Washington Nationals activated LHP Matt Cronin.) |
| | 投手 | Activated (The Washington Nationals activated RHP Amos Willingham.) |
| | 投手 | Activated (The Washington Nationals activated RHP Jake Irvin.) |
| | 投手 | Activated (The Washington Nationals activated RHP Mason Thompson.) |
| | 投手 | Declared Free Agency (Washington Nationals RHP Wily Peralta declared free agency.) |
| | 投手 | Declared Free Agency (Washington Nationals RHP Carl Edwards declared free agency.) |
| | 一壘手 | Declared Free Agency (INF Michael Chavis declared free agency.) |
| | 左外野手 | Declared Free Agency (OF Blake Rutherford declared free agency.) |
| | 左外野手 | Sent to Minors (The Washington Nationals sent OF Blake Rutherford outright to the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals sent RHP Hobie Harris outright to the minors.) |
| | 一壘手 | Sent to Minors (The Washington Nationals sent INF Michael Chavis outright to the minors.) |
| | 投手 | Declared Free Agency (LHP Anthony Banda declared free agency.) |
| | 游擊手 | Released (The Washington Nationals released INF Lucius Fox.) |
| | 二壘手 | Declared Free Agency (INF Travis Blankenhorn elected free agency.) |
| | 二壘手 | Sent to Minors (The Washington Nationals sent INF Travis Blankenhorn outright to the minors.) |
| | 二壘手 | Activated (The Washington Nationals activated INF Travis Blankenhorn from the 10-day injured list.) |
| | 投手 | Released (The Washington Nationals released RHP Víctor Arano.) |
| | 中外野手 | Released (The Washington Nationals released OF Derek Hill.) |
| | 二壘手 | Designated for Assignment (The Washington Nationals designated INF Travis Blankenhorn for assignment.) |
| | 投手 | Designated for Assignment (The Washington Nationals designated RHP Victor Arano for assignment.) |
| | 投手 | Placed on Paternity Leave List (The Washington Nationals placed LHP Robert Garcia on the Paternity Leave list.) |
| | 捕手 | Placed on 60-Day IL (The Washington Nationals transferred C Riley Adams to the 60-day injured list.) |
| | 投手 | Activated (The Washington Nationals activated RHP Tanner Rainey from the 60-day injured list.) |
| | 投手 | Retired (LHP Sean Doolittle retired from Major League Baseball.) |
| | 投手 | Retired (LHP Sean Doolittle has retired from Major League Baseball.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals recalled LHP Joe La Sorsa from the minors.) |
| | 投手 | Placed on 15-Day IL (The Washington Nationals placed RHP Jake Irvin on the 15-day injured list.) |
| | 二壘手 | Placed on 10-Day IL (The Washington Nationals placed INF Travis Blankenhorn on the 10-day injured list.) |
| | 左外野手 | Recalled From Minors Rehab (The Washington Nationals recalled OF Blake Rutherford from the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Amos Willingham to the minors.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals recalled RHP Cory Abbott from the minors.) |
| | 投手 | Released (The Washington Nationals released RHP José Mujica.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned LHP Joe La Sorsa to the minors.) |
| | 投手 | Activated (The Washington Nationals activated RHP Thaddeus Ward from the 15-day injured list.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals recalled RHP Jackson Rutledge from the minors.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned RHP Mason Thompson to the minors.) |
| | 投手 | Placed on 15-Day IL (The Washington Nationals placed LHP MacKenzie Gore on the 15-day injured list.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals recalled LHP Joe La Sorsa from the minors.) |
| | 二壘手 | Recalled From Minors Rehab (The Washington Nationals recalled INF Luis García from the minors.) |
| | 捕手 | Placed on 10-Day IL (The Washington Nationals placed C Riley Adams on the 10-day injured list.) |
| | 投手 | Activated (The Washington Nationals activated LHP MacKenzie Gore from the bereavement list.) |
| | 投手 | Sent to Minors (The Washington Nationals optioned LHP Joe La Sorsa to the minors.) |
| | 投手 | Signed (The Washington Nationals signed RHP Rico Garcia to a minor league contract.) |
| | 二壘手 | Recalled From Minors Rehab (The Washington Nationals selected the contract of INF Travis Blankenhorn from the minors.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals recalled RHP Amos Willingham from the minors.) |
| | 投手 | Released (The Washington Nationals released RHP Rico Garcia.) |
| | 投手 | Recalled From Minors Rehab (The Washington Nationals recalled LHP Joe La Sorsa from the minors.) |
| | 投手 | Placed on Bereavement/Family Medical Emergency List (The Washington Nationals placed LHP MacKenzie Gore on the bereavement list.) |
| | 投手 | Released (The Washington Nationals released RHP Luis Cessa.) |