2021 New York Mets season

The 2021 New York Mets season was the franchise's 60th season, the team's 13th season at Citi Field, and their first season under new majority owner Steve Cohen.

The Mets began the 2021 season 35–25 and held first place in the National League East at the All-Star break. The Mets stumbled along the way, losing first place in early August to the Atlanta Braves. On September 25, the Mets were eliminated from playoff contention in a 2–1 loss to the Milwaukee Brewers, continuing a five-year-long playoff drought. On September 26, the team suffered its 82nd loss, sealing their fourth losing season in five years. The Mets spent 103 days in first place, marking the most days in MLB history a team has been in first and finished with a losing record. The Mets finished the regular season 77–85, giving them a third place finish. On October 4, Luis Rojas was declined his club option as manager, following the conclusion of the regular season. Their division rival, Atlanta Braves, went on to win the World Series to leave the Mets as the only NL East team to not win the title in the 21st century.

Uniform
The 2021 season was the first since the 2012 season that the team's late 1990s-2000s era black alternate uniforms were worn, but only for select home game days. On July 15, the team announced that starting July 30, the Mets would wear their black jerseys every home Friday game for the rest of the year. It was the first time since July 12, 2012, that the team wore the black alternates. The Mets suited up in the throwback tops on August 13 against the Dodgers, August 27 against the Nationals, September 10 against the Yankees, and September 17 against the Phillies.

2020

 * November 30 – right-handed reliever Jacob Barnes signs a 1-year, $750,000 contract with the Mets.
 * December 2 – right-handed reliever Trevor May signs a 2-year deal with the Mets for $15.5 million.
 * December 15 – catcher James McCann signs a 4-year, $40.6 million contract with the Mets.
 * December 22 – Noah Syndergaard re-signs with the Mets for a 1-year contract for $9.7 million.

2021

 * January 7 – acquired right-handed pitcher Carlos Carrasco and shortstop Francisco Lindor from the Cleveland Indians for infielders Amed Rosario and Andrés Giménez, and two prospects (Josh Wolf, and Isaiah Greene).
 * January 8 – acquired left-handed pitcher Stephen Tarpley from the Miami Marlins off waivers.
 * January 14 – utility player José Martinez signs with the Mets for a 1-year, $1 million contract.
 * January 15 – Edwin Díaz re-signs with the Mets for a one-year deal worth $7 million. Seth Lugo re-signs with the Mets for a 1-year, $2.925 million contract. Robert Gsellman re-signs with the Mets for a 1-year $1.3 million deal. Brandon Nimmo re-signs with the Mets for a 1-year, $4.7 million contract. Michael Conforto re-signs with the Mets for a 1-year contract worth $12.250 million. Dominic Smith re-signs with the Mets for a 1-year, $2.550 million contract.
 * January 30 – left-handed pitcher Aaron Loup signs with the Mets for a 1-year, $3 million contract.
 * February 10 – acquired outfielder Khalil Lee from the Kansas City Royals for right-handed pitcher Josh Winckowski and a player to be named to the Boston Red Sox.
 * February 11 – infielder Jonathan Villar signs with the Mets for a 1-year, $3.55 million contract.
 * February 20 – right-handed pitcher Taijuan Walker signs a two-year, $20 million contract with a player option for the 2023 season.
 * February 21 – outfielder Kevin Pillar signs with the Mets for a 1-year, $5 million contract.
 * March 31 – shortstop Francisco Lindor signs an extension with the Mets for a 10-year, $341 million contract.

2021

 * May 18 – acquired outfielder Cameron Maybin from the Chicago Cubs in exchange for cash considerations.
 * May 25 – acquired outfielder Billy McKinney from the Milwaukee Brewers in exchange for minor league pitcher Pedro Quintana.
 * July 21 – acquired minor league outfielder Carlos Rincon from the Los Angeles Dodgers and cash considerations in exchange for Billy McKinney. Mets also claimed right-hander Roel Ramírez off waivers from the St. Louis Cardinals.
 * July 30 – acquired shortstop/second baseman Javier Báez and right-handed pitcher Trevor Williams from the Chicago Cubs for minor league outfielder Pete Crow-Armstrong.

Batting
Note: G = Games played; AB = At bats; R = Runs; H = Hits; 2B = Doubles; 3B = Triples; HR = Home runs; RBI = Runs batted in; SB = Stolen bases; BB = Walks; AVG = Batting average; SLG = Slugging average Source:

Pitching
Note: W = Wins; L = Losses; ERA = Earned run average; G = Games pitched; GS = Games started; SV = Saves; IP = Innings pitched; H = Hits allowed; R = Runs allowed; ER = Earned runs allowed; BB = Walks allowed; SO = Strikeouts Source: