This is alist of seasons completed by theWashington Nationals, originally known as theMontreal Expos, professional baseball franchise; they have played in theNational League from their inception in 1969. They are an Americanprofessional baseball team that has been based inWashington, D.C. since2005. The Nationals are a member of both theMajor League Baseball's (MLB)National League Eastern Division. Sincethe 2008 season, the Nationals have played inNationals Park; from 2005 through2007, the team played inRobert F. Kennedy Memorial Stadium.

As the Expos, the team had just fourteen of their 36 seasons finish with a winning record. The Expos made the postseason for the only time in 1981 as champions of the second half of the strike-shortened season. They then met thePhiladelphia Phillies in the1981 National League Division Series, defeating them in five games. They faced theLos Angeles Dodgers in the1981 National League Championship Series but lost in five games. The 1994 team was 74–40at the time of the league-wide strike that killed the season, with their winning percentage of .649 still being a team record. The Expos played inMontreal,Quebec, Canada asexpansion team in1969 through2004, with the majority of that time (1977–2004) spent in Montreal'sOlympic Stadium. Dissatisfaction with the stadium resulted in their relocation to Washington in 2005.

While the Nationals had a losing record in six of their first seven seasons, the team eventually came together in 2012 under the talent of players such as rookieBryce Harper and pitcherStephen Strasburg to win their first NL East title in 2012 and bring playoff baseball back to Washington for the first time since1933. In the2012 National League Division Series, the Nationals were one out away from winning Game 5 against the St. Louis Cardinals before they rallied to defeat and eliminate the Nationals. From 2012 to 2017, the Nationals would win the NL East four times but lost in the NLDS each time, with three of them going the full five games. In 2019, the Nationals had won just 19 of their first 50 games but managed to reach the postseason with a 93–69 record as the second Wild Card team in the NL. They defeated the Milwaukee Brewers in the Wild Card Game for their first win in a winner-take-all postseason game since moving to Washington. They upset the Los Angeles Dodgers in the NLDS that went the full five games before sweeping the St. Louis Cardinals in the NLCS. With the win in their 51st season as a franchise, it ended thelongest drought for a team's first pennant in MLB history. In the2019 World Series, led by Strasburg,Max Scherzer andJuan Soto, the Nationals rallied from a 3–2 series deficit by winning the last two games on the road, withHowie Kendrick hitting a go-ahead home run in the seventh inning of Game 7 to give Washington their first World Series championship, with Strasberg being namedWorld Series MVP. Since the end of 2019, the Nationals have not reached the postseason, finishing 5th in the NL East in five of the last six seasons from 2020 to 2025.

The following takes into account both teams, as all Montreal records were carried with the franchise when it moved to Washington.

The following table describes the Expos′ (1969–2004) and Nationals′ (2005–2025) combined regular-season won–lost record by decade.

These statistics are fromBaseball-Reference.com'sWashington Nationals History & Encyclopedia, and are current as of September 28, 2025^[8]

The Nationals have made the postseasonsix times in their history, with their first being in 1981 (as the Expos) and the most recent being in 2019.

• ^a The1972 Major League Baseball strike forced the cancellation of the first seven games (thirteen game-days) of the season.^[9]
• ^b The1981 Major League Baseball strike caused the season to split into two halves. This caused Major League Baseball to hold the Divisional Series so that the first- and second-half champions could play each other to determine playoff spots for the NLCS and World Series.^[10] As such, the Expos finished one-half game ahead of the second-placeSt. Louis Cardinals in the second half of the 1981 season.
• ^c The1994–95 Major League Baseball strike ended the season on August 11, as well as cancelling the entire postseason. While Montreal was leading by six games ahead of the second-placeAtlanta Braves at the beginning of the strike, no team was officially awarded any division titles.^[11]
• ^d PCA-PI stands forPlayers' Choice Award for Outstanding Pitcher in theNational League.
• ^e RMA stands for theNational LeagueRolaids Relief Man Award.

• Washington Nationals seasons
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