Mets Roster & Staff
Transactions
| Date | Transaction |
| 02/24/21 | New York Mets signed free agent C Caleb Joseph. |
| 02/24/21 | New York Mets signed free agent C Caleb Joseph. |
| 02/24/21 | Atlanta Braves claimed CF Guillermo Heredia off waivers from New York Mets. |
| 02/21/21 | New York Mets signed free agent CF Kevin Pillar. |
| 02/21/21 | New York Mets signed free agent CF Kevin Pillar. |
| 02/21/21 | New York Mets designated CF Guillermo Heredia for assignment. |
| 02/21/21 | New York Mets signed free agent CF Kevin Pillar. |
| 02/21/21 | New York Mets signed free agent CF Kevin Pillar. |
| 02/21/21 | New York Mets signed free agent CF Kevin Pillar. |
| 02/20/21 | New York Mets placed RHP Noah Syndergaard on the 60-day injured list. Recovery from Tommy John surgery. |
| 02/20/21 | New York Mets signed free agent RHP Taijuan Walker. |
| 02/20/21 | New York Mets signed free agent P Taijuan Walker. |
| 02/20/21 | New York Mets signed free agent RHP Taijuan Walker. |
| 02/20/21 | New York Mets signed free agent P Taijuan Walker. |
| 02/20/21 | New York Mets signed free agent RHP Taijuan Walker. |
| 02/16/21 | New York Mets invited non-roster RHP Corey Oswalt to spring training. |
| 02/16/21 | P Corey Oswalt assigned to New York Mets . |
| 02/16/21 | New York Mets sent RHP Corey Oswalt outright to Syracuse Mets. |
| 02/16/21 | New York Mets released RHP Brad Brach. |
| 02/14/21 | New York Mets signed free agent LHP Mike Montgomery to a minor league contract and invited him to spring training. |
| 02/14/21 | New York Mets signed free agent RHP Tommy Hunter to a minor league contract and invited him to spring training. |
| 02/13/21 | SS Ronny Mauricio assigned to New York Mets . |
| 02/13/21 | New York Mets invited non-roster 3B Mark Vientos to spring training. |
| 02/13/21 | New York Mets invited non-roster LF Tim Tebow to spring training. |
| 02/13/21 | New York Mets invited non-roster RHP Matthew Allan to spring training. |
| 02/13/21 | New York Mets invited non-roster 3B Brett Baty to spring training. |
| 02/13/21 | OF Pete Crow-Armstrong assigned to New York Mets . |
| 02/13/21 | 3B Brett Baty assigned to New York Mets . |
| 02/13/21 | New York Mets invited non-roster SS Ronny Mauricio to spring training. |
| 02/13/21 | New York Mets invited non-roster RHP Marcel Renteria to spring training. |
| 02/13/21 | New York Mets invited non-roster RHP Ryley Gilliam to spring training. |
| 02/13/21 | SS Mark Vientos assigned to New York Mets . |
| 02/13/21 | C Nick Meyer assigned to New York Mets . |
| 02/13/21 | New York Mets invited non-roster C Francisco Alvarez to spring training. |
| 02/13/21 | C Francisco Alvarez assigned to New York Mets . |
| 02/13/21 | P Matthew Allan assigned to New York Mets . |
| 02/13/21 | New York Mets invited non-roster OF Pete Crow-Armstrong to spring training. |
| 02/13/21 | P Ryley Gilliam assigned to New York Mets . |
| 02/13/21 | P Marcel Renteria assigned to New York Mets . |
| 02/13/21 | New York Mets invited non-roster C Nick Meyer to spring training. |
| 02/13/21 | P Tylor Megill assigned to New York Mets . |
| 02/13/21 | New York Mets invited non-roster RHP Tylor Megill to spring training. |
| 02/12/21 | New York Mets traded C Ali Sanchez to St. Louis Cardinals for cash. |
| 02/11/21 | New York Mets signed free agent SS Jonathan Villar. |
| 02/11/21 | New York Mets signed free agent SS Jonathan Villar. |
| 02/11/21 | New York Mets signed free agent SS Jonathan Villar. |
| 02/11/21 | New York Mets signed free agent SS Jonathan Villar. |
| 02/11/21 | New York Mets designated RHP Brad Brach for assignment. |
| 02/11/21 | New York Mets signed free agent SS Jonathan Villar. |
| 02/11/21 | New York Mets signed free agent SS Jonathan Villar. |
| 02/10/21 | Boston Red Sox Traded cash and LF Andrew Benintendi to Kansas City Royals; Kansas City Royals Traded Player To Be Named Later, Player To Be Named Later and CF Franchy Cordero to Boston Red Sox; Kansas City Royals Traded CF Khalil Lee to New York Mets and New York Mets Traded Player To Be Named Later and Josh Winckowski to Boston Red Sox. |
| 02/10/21 | New York Mets signed free agent CF Albert Almora Jr.. |
| 02/10/21 | Boston Red Sox Traded cash and LF Andrew Benintendi to Kansas City Royals; Kansas City Royals Traded Player To Be Named Later, Player To Be Named Later and CF Franchy Cordero to Boston Red Sox; Kansas City Royals Traded CF Khalil Lee to New York Mets and New York Mets Traded Player To Be Named Later and Josh Winckowski to Boston Red Sox. |
| 02/10/21 | New York Mets signed free agent CF Albert Almora Jr.. |
| 02/10/21 | New York Mets signed free agent CF Albert Almora Jr.. |
| 02/10/21 | New York Mets designated RHP Corey Oswalt for assignment. |
| 02/10/21 | New York Mets signed free agent CF Albert Almora Jr.. |
| 02/10/21 | New York Mets signed free agent CF Albert Almora Jr.. |
| 02/10/21 | New York Mets designated C Ali Sanchez for assignment. |
| 02/03/21 | Los Angeles Angels claimed 2B Robel Garcia off waivers from New York Mets. |
| 02/01/21 | Miami Marlins traded RHP Jordan Yamamoto to New York Mets for SS Federico Polanco. |
| 02/01/21 | New York Mets designated 2B Robel Garcia for assignment. |
| 02/01/21 | Miami Marlins traded RHP Jordan Yamamoto to New York Mets for SS Federico Polanco. |