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| Date | Type | Move |
|---|---|---|
| 2026-09-28 | Waiver claim | St. Louis Cardinals claimed RHP Chase Hampton off waivers from Washington Nationals. |
| 2026-09-26 | DFA | Washington Nationals designated RHP Chase Hampton for assignment. |
| 2026-09-12 | Waiver claim | Washington Nationals claimed RHP Chase Hampton off waivers from New York Yankees. |
| 2026-09-06 | Outright | Washington Nationals sent RHP Max Kranick outright to Rochester Red Wings. |
| 2026-09-04 | DFA | Washington Nationals designated RHP Max Kranick for assignment. |
| 2026-09-04 | Outright | Washington Nationals sent LHP Tom Cosgrove outright to Rochester Red Wings. |
| 2026-09-02 | DFA | Washington Nationals designated LHP Tom Cosgrove for assignment. |
| 2026-08-25 | DFA | Washington Nationals designated RHP Trevor Williams for assignment. |
| 2026-08-22 | Waiver claim | Washington Nationals claimed RHP Matt Waldron off waivers from Toronto Blue Jays. |
| 2026-08-12 | DFA | Washington Nationals designated RHP Miles Mikolas for assignment. |
| 2026-08-06 | Waiver claim | Washington Nationals claimed RHP Wyatt Mills off waivers from Los Angeles Dodgers. |
| 2026-08-05 | DFA | Washington Nationals designated RHP Zack Littell for assignment. |
| 2026-07-29 | Outright | Washington Nationals sent LHP Matt Krook outright to Rochester Red Wings. |
| 2026-07-27 | DFA | Washington Nationals designated LHP Matt Krook for assignment. |
| 2026-07-23 | Outright | Washington Nationals sent RHP Justin Lawrence outright to Rochester Red Wings. |
| 2026-07-21 | DFA | Washington Nationals designated RHP Justin Lawrence for assignment. |
| 2026-07-14 | Outright | Washington Nationals sent LHP Matt Krook outright to Rochester Red Wings. |
| 2026-07-12 | DFA | Washington Nationals designated LHP Matt Krook for assignment. |
| 2026-07-12 | Outright | Washington Nationals sent CF Robert Hassell III outright to Rochester Red Wings. |
| 2026-07-11 | Waiver claim | Detroit Tigers claimed RHP Andre Granillo off waivers from Washington Nationals. |
| 2026-07-05 | DFA | Washington Nationals designated CF Robert Hassell III for assignment. |
| 2026-07-04 | DFA | Washington Nationals designated RHP Andre Granillo for assignment. |
| 2026-07-04 | Waiver claim | Washington Nationals claimed LHP Matt Krook off waivers from Athletics. |
| 2026-06-29 | Outright | Washington Nationals sent RHP Jhancarlos Lara outright to Harrisburg Senators. |
| 2026-06-24 | DFA | Washington Nationals designated RHP Jhancarlos Lara for assignment. |
| 2026-06-24 | Waiver claim | Washington Nationals claimed RHP Justin Lawrence off waivers from Minnesota Twins. |
| 2026-06-12 | DFA | Washington Nationals designated RHP Julian Fernández for assignment. |
| 2026-06-12 | Waiver claim | Washington Nationals claimed RHP Jhancarlos Lara off waivers from Atlanta Braves. |
| 2026-05-10 | Waiver claim | Philadelphia Phillies claimed RHP Jackson Rutledge off waivers from Washington Nationals. |
| 2026-05-05 | DFA | Washington Nationals designated RHP Jackson Rutledge for assignment. |
| 2026-05-03 | Waiver claim | Washington Nationals claimed RHP Zak Kent off waivers from Minnesota Twins. |
| 2026-05-02 | Outright | Washington Nationals sent LHP Cionel Pérez outright to Rochester Red Wings. |
| 2026-03-28 | DFA | Washington Nationals designated LHP Jake Eder for assignment. |
| 2026-03-22 | DFA | Washington Nationals designated RHP Griff McGarry for assignment. |
| 2026-03-14 | Waiver claim | New York Mets claimed LHP Richard Lovelady off waivers from Washington Nationals. |
| 2026-03-10 | DFA | Washington Nationals designated LHP Richard Lovelady for assignment. |
| 2026-02-06 | Waiver claim | Boston Red Sox claimed SS Tsung-Che Cheng off waivers from Washington Nationals. |
| 2026-02-05 | DFA | Washington Nationals designated RHP George Soriano for assignment. |
| 2026-02-05 | Waiver claim | Washington Nationals claimed LHP Ken Waldichuk off waivers from Tampa Bay Rays. |
| 2026-02-04 | Outright | Washington Nationals sent LHP Konnor Pilkington outright to Rochester Red Wings. |
| 2026-02-04 | Waiver claim | Boston Red Sox claimed 2B Mickey Gasper off waivers from Washington Nationals. |
| 2026-01-30 | DFA | Washington Nationals designated SS Tsung-Che Cheng for assignment. |
| 2026-01-30 | Waiver claim | Washington Nationals claimed RHP George Soriano off waivers from Atlanta Braves. |
| 2026-01-29 | DFA | Washington Nationals designated 2B Mickey Gasper for assignment. |
| 2026-01-29 | Waiver claim | Washington Nationals claimed LHP Richard Lovelady off waivers from New York Mets. |
| 2026-01-28 | DFA | Washington Nationals designated LHP Konnor Pilkington for assignment. |
| 2026-01-28 | Outright | Washington Nationals sent C Riley Adams outright to Rochester Red Wings. |
| 2026-01-28 | Waiver claim | Washington Nationals claimed SS Tsung-Che Cheng off waivers from New York Mets. |
| 2026-01-27 | Outright | Washington Nationals sent RHP Andry Lara outright to Rochester Red Wings. |
| 2026-01-22 | DFA | Washington Nationals designated C Riley Adams for assignment. |
| 2026-01-22 | Waiver claim | Washington Nationals claimed RHP Gus Varland off waivers from Arizona Diamondbacks. |
| 2026-01-20 | DFA | Washington Nationals designated RHP Andry Lara for assignment. |
| 2026-01-20 | Waiver claim | Washington Nationals claimed 2B Mickey Gasper off waivers from Minnesota Twins. |
| 2026-01-09 | Waiver claim | Washington Nationals claimed RHP Paxton Schultz off waivers from Toronto Blue Jays. |
| 2026-01-05 | Waiver claim | Washington Nationals claimed LF Joey Wiemer off waivers from San Francisco Giants. |
Waiver rows: the official MLB StatsAPI transaction feed's waiver-claim, designated-for-assignment and outright-assignment entries involving the club on either side, 2026 season to date. Free-agency elections that follow a DFA are a different feed type and stay on the transaction log. Every trade, signing and release involving the Nationals is also staged: see the 2026 Nationals transaction log or the full 1945-2026 transaction archive.