Washington Nationals
All Transactions |  | | | | Saturday, July 7th, 2029 | | Signed SP S. Atmore to a 3-year contract extension worth a total of $21,000,000. |
| Monday, July 2nd, 2029 | | Placed LF S. Noriega on the 15-day disabled list. | | Placed LF P. Byrd on the 40-man roster. | | Purchased the contract of LF P. Byrd from Triple A Oklahoma. |
| Monday, June 25th, 2029 | | Placed 1B W. Thesing on irrevocable waivers. | | Designated 1B W. Thesing for assignment. | | Placed 1B B. Poch on the active roster. | | Activated 1B B. Poch from the disabled list. |
| Monday, June 11th, 2029 | | Placed 1B B. Poch on the 15-day disabled list. | | Placed 1B W. Thesing on the 40-man roster. | | Purchased the contract of 1B W. Thesing from Triple A Oklahoma. |
| Friday, June 1st, 2029 | | Drafted SP C. O'Quinsalen in the 2029 first-year player draft (Round 1, Pick 10, 10th overall Pick). | | Drafted MR E. Sandifer in the 2029 first-year player draft (Round 2, Pick 10, 32nd overall Pick). | | Drafted 2B M. Weaver in the 2029 first-year player draft (Round 3, Pick 10, 54th overall Pick). | | Drafted 1B S. Anderson in the 2029 first-year player draft (Round 4, Pick 10, 76th overall Pick). | | Drafted CF J. Vásquez in the 2029 first-year player draft (Round 5, Pick 10, 98th overall Pick). | | Drafted RF L. Mayes in the 2029 first-year player draft (Round 6, Pick 10, 120th overall Pick). | | Drafted MR D. Pérez in the 2029 first-year player draft (Round 7, Pick 10, 142nd overall Pick). | | Drafted RF M. Lépine in the 2029 first-year player draft (Round 8, Pick 10, 164th overall Pick). | | Drafted LF R. García in the 2029 first-year player draft (Round 9, Pick 10, 186th overall Pick). | | Drafted SS E. Martínez in the 2029 first-year player draft (Round 10, Pick 10, 208th overall Pick). | | Drafted SS M. McCliverty in the 2029 first-year player draft (Round 11, Pick 10, 230th overall Pick). | | Drafted 1B S. Watkins in the 2029 first-year player draft (Round 12, Pick 10, 252nd overall Pick). | | Drafted MR J. Sáenz in the 2029 first-year player draft (Round 13, Pick 10, 274th overall Pick). | | Drafted CF E. Árias in the 2029 first-year player draft (Round 14, Pick 10, 296th overall Pick). | | Drafted CF M. Chambers in the 2029 first-year player draft (Round 15, Pick 10, 318th overall Pick). | | Drafted SS K. Cassell in the 2029 first-year player draft (Round 16, Pick 10, 340th overall Pick). |
| Tuesday, May 15th, 2029 | | Signed free agent 1B M. Saito to a 1-year contract worth a total of $100,000. |
| Tuesday, April 24th, 2029 | | Signed free agent MR A. Mendoza to a 1-year contract worth a total of $100,000. |
| Tuesday, April 3rd, 2029 | | Signed free agent MR C. Stokes to a 1-year contract worth a total of $1,500,000. |
| Sunday, March 4th, 2029 | | Signed free agent 3B J. Monroy to a 1-year contract worth a total of $100,000. |
| Saturday, March 3rd, 2029 | | Placed 1B B. Poch on the 40-man roster. | | Purchased the contract of 1B B. Poch from Triple A Oklahoma. | | Placed 1B W. Thesing on irrevocable waivers. | | Designated 1B W. Thesing for assignment. |
| Thursday, February 1st, 2029 | | Purchased the contract of MR D. Uchida from Triple A Oklahoma. |
| Friday, December 22nd, 2028 | | Signed free agent SP D. Arenas to a minor league contract. |
| Friday, December 8th, 2028 | | Signed free agent SP K. Henshaw to a minor league contract. |
| Wednesday, December 6th, 2028 | | Signed free agent SP S. Blanco to a minor league contract. |
| Monday, December 4th, 2028 | | Signed free agent MR T. Ottem to a 2-year contract worth a total of $7,000,000. |
| Monday, November 20th, 2028 | | CF J. Blake received a 1-year contract through automatic renewal worth a total of $100,000. | | MR P. Palomo becomes a free-agent. | | 3B R. Okada received a 1-year contract through automatic renewal worth a total of $100,000. | | MR J. Behne becomes a free-agent. | | 3B A. Hooper received a 1-year contract through automatic renewal worth a total of $100,000. | | 1B W. Thesing received a 1-year contract through automatic renewal worth a total of $100,000. | | SP F. García received a 1-year contract through automatic renewal worth a total of $100,000. | | CF P. Rainbolt received a 1-year contract through automatic renewal worth a total of $100,000. | | MR J. Moore received a 1-year contract through automatic renewal worth a total of $100,000. | | C A. Stevens received a 1-year contract through automatic renewal worth a total of $100,000. | | LF G. Fox becomes a free-agent. | | SP E. Bogar becomes a free-agent. | | SP C. Scott becomes a free-agent. | | SP C. Ruch becomes a free-agent. | | SP A. Ramirez becomes a free-agent. | | CF R. Cook becomes a free-agent. | | SP S. Slorah got drafted by the Colorado Rockies. | | 2B J. García got drafted by the Colorado Rockies. | | 2B S. MacKinsar got drafted by the Milwaukee Brewers. | | SP T. Begin got drafted by the Milwaukee Brewers. |
| Friday, November 17th, 2028 | | SP S. Atmore received a 1-year contract through arbitration worth a total of $4,772,400. | | MR J. Arevalo received a 1-year contract through arbitration worth a total of $1,643,760. | | LF J. Long received a 1-year contract through arbitration worth a total of $5,152,500. | | C L. Cruz received a 1-year contract through arbitration worth a total of $200,000. | | RF R. Duncan received a 1-year contract through arbitration worth a total of $3,544,020. |
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