Mets Roster & Staff
Transactions
| Date | Transaction |
| 08/31/20 | New York Mets optioned RHP Drew Smith to Mets Alternate Training Site. |
| 08/31/20 | New York Mets selected the contract of RHP Hunter Strickland from Mets Alternate Training Site. |
| 08/31/20 | Texas Rangers traded 3B Todd Frazier to New York Mets for Player To Be Named Later. |
| 08/31/20 | Texas Rangers traded C Robinson Chirinos and cash to New York Mets for Player To Be Named Later. |
| 08/31/20 | Baltimore Orioles traded RHP Miguel Castro to New York Mets for LHP Kevin Smith and Player To Be Named Later. Victor Gonzalez sent to Orioles to complete trade, 9/20/2020 |
| 08/31/20 | Baltimore Orioles traded RHP Miguel Castro to New York Mets for LHP Kevin Smith and Player To Be Named Later. Victor Gonzalez sent to Orioles to complete trade, 9/20/2020 |
| 08/31/20 | New York Mets optioned RHP Ariel Jurado to Mets Alternate Training Site. |
| 08/30/20 | New York Mets placed LHP Steven Matz on the 10-day injured list. Left shoulder discomfort. |
| 08/30/20 | New York Mets sent CF Juan Lagares outright to Mets Alternate Training Site. |
| 08/30/20 | New York Mets recalled RHP Franklyn Kilome from Mets Alternate Training Site. |
| 08/30/20 | New York Mets recalled Ariel Jurado from Mets Alternate Training Site. |
| 08/30/20 | New York Mets transferred 2B Eduardo Nunez from the 10-day injured list to the 60-day injured list. Left knee contusion. |
| 08/30/20 | New York Mets recalled Drew Smith from Mets Alternate Training Site. |
| 08/30/20 | New York Mets invited non-roster 3B Mark Vientos to spring training. |
| 08/30/20 | CF Juan Lagares elected free agency. |
| 08/30/20 | New York Mets placed RHP Dellin Betances on the 10-day injured list. Right lat tightness. |
| 08/29/20 | New York Mets optioned C Patrick Mazeika to Mets Alternate Training Site. |
| 08/28/20 | New York Mets designated RHP Walker Lockett for assignment. |
| 08/28/20 | New York Mets designated Juan Lagares for assignment. |
| 08/28/20 | New York Mets activated CF Jake Marisnick from the 10-day injured list. |
| 08/28/20 | New York Mets recalled Patrick Mazeika from Mets Alternate Training Site. |
| 08/28/20 | New York Mets activated SS Andres Gimenez from the 10-day injured list. |
| 08/28/20 | New York Mets activated LHP David Peterson from the 10-day injured list. |
| 08/28/20 | New York Mets claimed CF Guillermo Heredia off waivers from Pittsburgh Pirates. |
| 08/28/20 | New York Mets placed RHP Corey Oswalt on the 10-day injured list. Right biceps tendinitis. |
| 08/27/20 | New York Mets activated RHP Michael Wacha from the 10-day injured list. |
| 08/27/20 | New York Mets invited non-roster 3B Brett Baty to spring training. |
| 08/27/20 | New York Mets optioned RHP Drew Smith to Mets Alternate Training Site. |
| 08/26/20 | Juan Lagares changed number to 15. |
| 08/26/20 | New York Mets optioned C Patrick Mazeika to Mets Alternate Training Site. |
| 08/25/20 | New York Mets selected the contract of Patrick Mazeika from Mets Alternate Training Site. |
| 08/25/20 | New York Mets placed C Tomas Nido on the 60-day injured list. |
| 08/25/20 | New York Mets recalled Ali Sanchez from Mets Alternate Training Site. |
| 08/25/20 | New York Mets placed SS Andres Gimenez on the 10-day injured list. |
| 08/25/20 | New York Mets selected the contract of CF Juan Lagares from Mets Alternate Training Site. |
| 08/23/20 | New York Mets released 2B Brian Dozier. |
| 08/18/20 | New York Mets placed LHP David Peterson on the 10-day injured list retroactive to August 14, 2020. Left shoulder fatigue. |
| 08/18/20 | New York Mets activated RHP Corey Oswalt. |
| 08/18/20 | New York Mets optioned RHP Franklyn Kilome to Mets Alternate Training Site. |
| 08/18/20 | New York Mets recalled Drew Smith from Mets Alternate Training Site. |
| 08/18/20 | New York Mets recalled RHP Corey Oswalt from Mets Alternate Training Site. |
| 08/16/20 | New York Mets transferred C Rene Rivera from the 10-day injured list to the 60-day injured list. Hyperextended left elbow. |
| 08/16/20 | New York Mets recalled Franklyn Kilome from Mets Alternate Training Site. |
| 08/16/20 | New York Mets invited non-roster SS Ronny Mauricio to spring training. |
| 08/16/20 | New York Mets designated 2B Brian Dozier for assignment. |
| 08/15/20 | New York Mets invited non-roster RHP Matthew Allan to spring training. |
| 08/15/20 | New York Mets invited non-roster C Francisco Alvarez to spring training. |
| 08/14/20 | New York Mets optioned RHP Drew Smith to Mets Alternate Training Site. |
| 08/14/20 | New York Mets activated 2B Robinson Cano from the 10-day injured list. |
| 08/11/20 | New York Mets activated RHP Walker Lockett from the 10-day injured list. |
| 08/11/20 | New York Mets activated RHP Brad Brach from the 10-day injured list. |
| 08/11/20 | New York Mets optioned C Ali Sanchez to Mets Alternate Training Site. |
| 08/11/20 | New York Mets optioned RHP Paul Sewald to Mets Alternate Training Site. |
| 08/10/20 | New York Mets placed RHP Marcus Stroman on the restricted list. |
| 08/09/20 | New York Mets recalled Ali Sanchez from Mets Alternate Training Site. |
| 08/09/20 | New York Mets placed RHP Michael Wacha on the 10-day injured list. Right shoulder inflammation. |
| 08/07/20 | New York Mets invited non-roster 2B Luis Carpio to spring training. |
| 08/07/20 | New York Mets optioned LHP Daniel Zamora to Mets Alternate Training Site. |
| 08/07/20 | New York Mets activated RHP Robert Gsellman from the 10-day injured list. |
| 08/07/20 | New York Mets sent RF Ryan Cordell outright to Mets Alternate Training Site. |
| 08/07/20 | New York Mets invited non-roster RF Ryan Cordell to spring training. |
| 08/06/20 | New York Mets optioned C Ali Sanchez to Mets Alternate Training Site. |
| 08/05/20 | New York Mets designated Ryan Cordell for assignment. |
| 08/05/20 | Texas Rangers traded RHP Ariel Jurado to New York Mets for Player To Be Named Later and cash. |
| 08/04/20 | New York Mets placed 2B Robinson Cano on the 10-day injured list. Grade 2 left two adductor strain. |
| 08/04/20 | New York Mets recalled CF Billy Hamilton from Mets Alternate Training Site. |
| 08/03/20 | New York Mets recalled Ali Sanchez from Mets Alternate Training Site. |
| 08/02/20 | New York Mets sent RHP Hunter Strickland outright to Mets Alternate Training Site. |
| 08/02/20 | New York Mets optioned RHP Franklyn Kilome to Mets Alternate Training Site. |
| 08/02/20 | San Francisco Giants traded OF Billy Hamilton to New York Mets for RHP Jordan Humphreys. |
| 08/02/20 | New York Mets activated RHP Jared Hughes from the 10-day injured list. |
| 08/02/20 | New York Mets traded RHP Tyler Bashlor to Pittsburgh Pirates for cash. |
| 08/02/20 | San Francisco Giants traded OF Billy Hamilton to New York Mets for RHP Jordan Humphreys. |
| 08/02/20 | New York Mets placed LF Yoenis Cespedes on the restricted list. |
| 08/02/20 | New York Mets invited non-roster RHP Hunter Strickland to spring training. |
| 08/02/20 | New York Mets transferred 2B Jed Lowrie from the 10-day injured list to the 60-day injured list. Left knee discomfort. |