| | RF | Signed (The Washington Nationals signed OF Harold Ramírez to a minor-league contract..) |
| | P | Claimed on Unconditional Release Waivers (The Washington Nationals claimed RHP Eduardo Salazar off waivers) |
| | 1B | Placed on 10-Day IL (The Washington Nationals placed INF Joey Gallo on the 10-day injured list with a hamstring injury.) |
| | 3B | Recalled From Minors Rehab (The Washington Nationals recalled INF Trey Lipscomb from the minors.) |
| | P | Placed on 15-Day IL (The Washington Nationals placed RHP Trevor Williams on the 15-day injured list.) |
| | P | Recalled From Minors Rehab (The Washington Nationals recalled LHP DJ Herz from the minors.) |
| | C | Recalled From Minors Rehab (The Washington Nationals recalled C Drew Millas from the minors.) |
| | C | Sent to Minors (The Washington Nationals optioned C Riley Adams to the minors.) |
| | RF | Released (The Washington Nationals released OF Victor Robles.) |
| | RF | Designated for Assignment (The Washington Nationals designated OF Victor Robles for assignment.) |
| | RF | Activated (The Washington Nationals activated OF Lane Thomas from the 10-day injured list.) |
| | 1B | Activated (The Washington Nationals activated INF Joey Gallo from the 10-day injured list.) |
| | 3B | Sent to Minors (The Washington Nationals optioned INF Trey Lipscomb to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Jackson Rutledge to the minors.) |
| | C | Signed (The Washington Nationals signed C CJ Stubbs to a minor league contract.) |
| | P | Recalled From Minors Rehab (The Washington Nationals recalled RHP Jackson Rutledge from the minors.) |
| | P | Declared Free Agency (RHP Matt Barnes elected free agency.) |
| | P | Sent to Minors (The Washington Nationals sent RHP Matt Barnes outright to the minors.) |
| | P | Activated (The Washington Nationals activated LHP Robert Garcia from the 15-day injured list.) |
| | P | Designated for Assignment (The Washington Nationals designated RHP Matt Barnes for assignment.) |
| | RF | Sent to Minors (The Washington Nationals optioned OF Alex Call to the minors.) |
| | RF | Activated (The Washington Nationals activated OF Victor Robles from the 10-day injured list.) |
| | 3B | Sent to Minors (The Washington Nationals sent INF Jake Alu to the minors.) |
| | 1B | Placed on 10-Day IL (The Washington Nationals placed 1B Joey Gallo on the 10-day injured list with a shoulder injury.) |
| | RF | Recalled From Minors Rehab (The Washington Nationals recalled OF Alex Call from the minors.) |
| | C | Activated (The Washington Nationals activated C Keibert Ruiz from the 10-day injured list.) |
| | C | Sent to Minors (The Washington Nationals optioned C Drew Millas to the minors.) |
| | RF | Placed on 10-Day IL (The Washington Nationals placed OF Lane Thomas on the 10-day injured list.) |
| | 3B | Recalled From Minors Rehab (The Washington Nationals recalled INF Trey Lipscomb from the minors.) |
| | P | Placed on 15-Day IL (The Washington Nationals placed RP Robert Garcia on the 15-day injured list.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of RP Jacob Barnes.) |
| | 3B | Designated for Assignment (The Washington Nationals designated INF Jake Alu for assignment.) |
| | P | Recalled From Minors Rehab (The Washington Nationals recalled LHP Mitchell Parker from the minors.) |
| | 3B | Activated (The Washington Nationals activated INF Nick Senzel from the 10-day injured list.) |
| | C | Placed on 10-Day IL (The Washington Nationals placed C Keibert Ruiz on the 10-day injured list with influenza.) |
| | 3B | Sent to Minors (The Washington Nationals optioned INF Trey Lipscomb to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Amos Willingham to the minors.) |
| | C | Recalled From Minors Rehab (The Washington Nationals recalled C Drew Millas from the minors.) |
| | P | Recalled From Minors Rehab (The Washington Nationals recalled RHP Amos Willingham from the minors.) |
| | C | Sent to Minors (The Washington Nationals optioned C Drew Millas to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Joan Adon to the minors.) |
| | C | Recalled From Minors Rehab (The Washington Nationals recalled C Drew Millas from the minors.) |
| | P | Placed on 15-Day IL (The Washington Nationals placed SP Josiah Gray on the 15-day injured list.) |
| | P | Recalled From Minors Rehab (The Washington Nationals recalled SP Joan Adon from the minors.) |
| | P | Retired (Washington Nationals RHP Stephen Strasburg retired from Major League Baseball.) |
| | LF | Recalled From Minors Rehab (The Washington Nationals recalled OF Jacob Young from the minors.) |
| | RF | Placed on 10-Day IL (The Washington Nationals placed OF Victor Robles on the 10-day injured list with a hamstring injury.) |
| | 3B | Recalled From Minors Rehab (The Washington Nationals selected the contract INF Trey Lipscomb from the minors.) |
| | 3B | Placed on 10-Day IL (The Washington Nationals placed INF Nick Senzel on the 10-day injured list with a fractured thumb.) |
| | P | Placed on 60-Day IL (The Washington Nationals placed RHP Stephen Strasburg on the 60-day injured list.) |
| | LF | Placed on 10-Day IL (The Washington Nationals placed OF Stone Garrett on the 10-day injured list.) |
| | 1B | Released (The Washington Nationals released INF Lewin Díaz.) |
| | P | Signed (The Washington Nationals signed RHP T.J. Zeuch to a minor league contract.) |
| | P | Signed (The Washington Nationals signed RHP T.J. Zeuch to a minor league contract.) |
| | 3B | Sent to Minors (The Washington Nationals sent INF Trey Lipscomb to the minors.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Derek Law from the minors.) |
| | P | Placed on 60-Day IL (The Washington Nationals placed RHP Cade Cavalli on the 60-day injured list.) |
| | P | Placed on 60-Day IL (The Washington Nationals placed LHP Jose A. Ferrer on the 60-day injured list.) |
| | P | Released (The Washington Nationals released RHP Zach Davies.) |
| | P | Placed on 60-Day IL (The Washington Nationals placed RHP Mason Thompson on the 60-day injured list.) |
| | CF | Sent to Minors (The Washington Nationals sent OF Robert Hassell to the minors.) |
| | C | Sent to Minors (The Washington Nationals sent C Israel Pineda to the minors.) |
| | CF | Sent to Minors (The Washington Nationals sent OF Dylan Crews to the minors.) |
| | LF | Recalled From Minors Rehab (The Washington Nationals selected the contract of OF Jesse Winker.) |
| | RF | Sent to Minors (The Washington Nationals sent OF James Wood to the minors.) |
| | RF | Recalled From Minors Rehab (The Washington Nationals selected the contract of OF Eddie Rosario from the minors.) |
| | P | Sent to Minors (The Washington Nationals sent LHP Joe La Sorsa to the minors.) |
| | P | Released (The Washington Nationals released RHP Luis Perdomo.) |
| | P | Sent to Minors (The Washington Nationals sent LHP Richard Bleier to the minors.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Matt Barnes from the minors.) |
| | LF | Sent to Minors (The Washington Nationals sent OF Juan Yepez to the minors.) |
| | SS | Sent to Minors (The Washington Nationals sent INF Brady House to the minors.) |
| | LF | Sent to Minors (The Washington Nationals optioned OF Jacob Young to the minors.) |
| | C | Sent to Minors (The Washington Nationals optioned C Drew Millas to the minors.) |
| | RF | Sent to Minors (The Washington Nationals optioned OF Alex Call to the minors.) |
| | 2B | Sent to Minors (The Washington Nationals sent INF Darren Baker to the minors.) |
| | 1B | Sent to Minors (The Washington Nationals sent INF Lewin Díaz to the minors.) |
| | P | Sent to Minors (The Washington Nationals sent RHP Luis Perdomo to the minors.) |
| | C | Sent to Minors (The Washington Nationals sent C Brady Lindsly to the minors.) |
| | P | Sent to Minors (The Washington Nationals sent RHP Robert Gsellman to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Jackson Rutledge to the minors.) |
| | 3B | Sent to Minors (The Washington Nationals sent INF Carter Kieboom outright to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Zach Brzykcy to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Thaddeus Ward to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned LHP DJ Herz to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Amos Willingham to the minors.) |
| | 3B | Sent to Minors (The Washington Nationals optioned OF Jake Alu to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned LHP Mitchell Parker to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Cole Henry to the minors.) |
| | P | Sent to Minors (The Washington Nationals optioned RHP Joan Adon to the minors.) |
| | RF | Signed (The Washington Nationals signed OF Eddie Rosario.) |
| | P | Signed (The Washington Nationals signed RHP Matt Barnes to a minor league contract.) |
| | P | Signed (The Washington Nationals signed RHP Matt Barnes to a minor league contract.) |
| | P | Non-roster Invitee (The Washington Nationals signed RHP Derek Law to a minor league contract with an invitation to spring training.) |
| | P | Signed (The Washington Nationals signed RHP Jacob Barnes to a minor league contract.) |
| | LF | Non-roster Invitee (The Washington Nationals signed DH Jesse Winker to a minor league contract with an invitation to spring training.) |
| | P | Non-roster Invitee (The Washington Nationals invited RHP Luis Perdomo to spring training.) |
| | P | Signed (The Washington Nationals signed RHP Luis Perdomo to a minor league contract.) |
| | P | Signed (The Washington Nationals signed RHP Luis Perdomo to a minor league contract.) |
| | P | Signed (The Washington Nationals signed RHP Luke Farrell to a minor league contract.) |
| | P | Non-roster Invitee (The Washington Nationals invited RHP Luke Farrell to spring training.) |
| | P | Signed (The Washington Nationals signed RHP Luke Farrell to a minor league contract.) |
| | P | Non-roster Invitee (The Washington Nationals signed RHP Stephen Nogosek to a minor league contract with an invitation to spring training.) |
| | P | Signed (The Washington Nationals signed RHP Adonis Medina to a minor league contract.) |
| | C | Sent to Minors (The Washington Nationals outrighted C Israel Pineda to the minors.) |
| | P | Non-roster Invitee (The Washington Nationals invited non-roster RHP Robert Gsellman to spring training.) |
| | P | Signed (The Washington Nationals signed LHP Richard Bleier to a minor league contract.) |
| | P | Signed (The Washington Nationals signed LHP Richard Bleier to a minor league contract.) |
| | P | Signed (The Washington Nationals signed RHP Robert Gsellman to a minor league contract.) |
| | P | Signed (The Washington Nationals signed RHP Robert Gsellman to a minor league contract.) |
| | 2B | Non-roster Invitee (The Washington Nationals invited INF Darren Baker to spring training.) |
| | C | Non-roster Invitee (The Washington Nationals invited C Brady Lindsly to spring training.) |
| | SS | Non-roster Invitee (The Washington Nationals invited INF Brady House to spring training.) |
| | CF | Non-roster Invitee (The Washington Nationals invited OF Dylan Crews to spring training.) |
| | P | Non-roster Invitee (The Washington Nationals invited LHP Joe La Sorsa to spring training.) |
| | CF | Non-roster Invitee (The Washington Nationals invited OF Robert Hassell III to spring training.) |
| | 3B | Non-roster Invitee (The Washington Nationals invited INF Trey Lipscomb to spring training.) |
| | LF | Non-roster Invitee (The Washington Nationals invited OF Juan Yepez to spring training.) |
| | RF | Non-roster Invitee (The Washington Nationals invited OF James Wood to spring training.) |
| | C | Designated for Assignment (The Washington Nationals designated C Israel Pineda for assignment.) |
| | 1B | Signed (The Washington Nationals signed OF Joey Gallo.) |
| | 2B | Non-roster Invitee (The Washington Nationals signed INF Travis Blankenhorn to a minor league contract with an invitation to spring training.) |
| | 3B | Signed (The Washington Nationals signed INF Nick Senzel.) |
| | P | Drafted Via Rule 5 (The Washington Nationals selected RHP Samuel Vasquez in the Rule 5 Draft.) |
| | LF | Signed (The Washington Nationals signed OF Juan Yepez to a minor league contract.) |
| | SS | Drafted Via Rule 5 (The Washington Nationals selected INF Nasim Nunez in the Rule 5 Draft.) |
| | P | Drafted Via Rule 5 (The Washington Nationals selected RHP Daison Acosta in the Rule 5 Draft.) |
| | P | Sent to Minors (The Washington Nationals sent LHP Joe La Sorsa outright to the minors.) |
| | RF | Signed (The Washington Nationals signed OF Jordan Qsar to a minor league contract.) |
| | P | Designated for Assignment (The Washington Nationals designated RHP Roddery Muñoz for assignment.) |
| | P | Designated for Assignment (The Washington Nationals designated LHP Joe La Sorsa for assignment.) |
| | 1B | Released (The Washington Nationals released INF Dominic Smith.) |
| | P | Released (The Washington Nationals released RHP Cory Abbott.) |
| | P | Designated for Assignment (The Washington Nationals designated RHP Cory Abbott for assignment.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Zach Brzykcy.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of LHP DJ Herz.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of RHP Cole Henry.) |
| | P | Recalled From Minors Rehab (The Washington Nationals selected the contract of LHP Mitchell Parker.) |
| | 1B | Designated for Assignment (The Washington Nationals designated INF Dominic Smith for assignment.) |
| | P | Released (The Washington Nationals released RHP Andrés Machado.) |
| | CF | Sent to Minors (The Washington Nationals sent OF Jeremy De La Rosa outright to the minors.) |
| | P | Sent to Minors (The Washington Nationals sent LHP Matt Cronin outright to the minors.) |
| | CF | Designated for Assignment (The Washington Nationals designated OF Jeremy De La Rosa for assignment.) |
| | P | Declared Free Agency (RHP Malvin Pena declared free agency.) |
| | P | Declared Free Agency (RHP Hobie Harris declared free agency.) |
| | P | Declared Free Agency (RHP Patrick Ruotolo declared free agency.) |
| | RF | Declared Free Agency (OF Donovan Casey declared free agency.) |
| | LF | Declared Free Agency (OF Yasel Antuna declared free agency.) |
| | P | Declared Free Agency (RHP Junior Fernández declared free agency.) |
| | SS | Declared Free Agency (INF Jose Sanchez declared free agency.) |
| | P | Declared Free Agency (RHP Tommy Romero declared free agency.) |
| | P | Declared Free Agency (RHP Gerardo Carrillo declared free agency.) |
| | P | Declared Free Agency (RHP Daniel Mengden declared free agency.) |
| | P | Declared Free Agency (LHP Alex Troop declared free agency.) |
| | RF | Declared Free Agency (OF Frankie Tostado declared free agency.) |
| | 2B | Declared Free Agency (INF Richie Martin declared free agency.) |
| | P | Declared Free Agency (RHP Jackson Tetreault declared free agency.) |
| | P | Declared Free Agency (RHP Gerson Moreno declared free agency.) |
| | P | Declared Free Agency (RHP Ronald Herrera declared free agency.) |
| | 1B | Declared Free Agency (INF Matt Adams declared free agency.) |
| | SS | Declared Free Agency (INF Nick Shumpert declared free agency.) |
| | P | Declared Free Agency (RHP Matt Merrill declared free agency.) |
| | P | Declared Free Agency (RHP Nash Walters declared free agency.) |
| | 3B | Declared Free Agency (INF Jake Noll declared free agency.) |
| | P | Declared Free Agency (RHP Odalvi Javier declared free agency.) |
| | P | Designated for Assignment (The Washington Nationals designated LHP Matt Cronin for assignment.) |
| | LF | Activated (The Washington Nationals activated OF Stone Garrett.) |
| | P | Activated (The Washington Nationals activated RHP Stephen Strasburg.) |
| | P | Activated (The Washington Nationals activated RHP Cade Cavalli.) |
| | RF | Activated (The Washington Nationals activated OF Victor Robles.) |
| | C | Activated (The Washington Nationals activated C Riley Adams.) |
| | SS | Activated (The Washington Nationals activated INF Jeter Downs.) |
| | CF | Activated (The Washington Nationals activated OF Jeremy De La Rosa.) |
| | P | Activated (The Washington Nationals activated RHP Robert Garcia.) |
| | C | Activated (The Washington Nationals activated C Israel Pineda.) |
| | P | Activated (The Washington Nationals activated RHP Roddery Muñoz.) |
| | P | Activated (The Washington Nationals activated LHP MacKenzie Gore.) |
| | P | Activated (The Washington Nationals activated LHP Matt Cronin.) |
| | P | Activated (The Washington Nationals activated RHP Amos Willingham.) |
| | P | Activated (The Washington Nationals activated RHP Jake Irvin.) |
| | P | Activated (The Washington Nationals activated RHP Mason Thompson.) |