• Bill Graham (1937)
• Jake Diekman (1987)

Transactions:
New York Mets released Bruce Bochy on January 21, 1983.

California Angels signed Ellis Valentine of the New York Mets as a free agent on January 21, 1983.

New York Mets signed free agent Rick Cerone on January 21, 1991.

New York Mets traded Luis Lopez to the Milwaukee Brewers for Bill Pulsipher on January 21, 2000.

New York Mets traded Todd Zeile and Benny Agbayani to the Colorado Rockies for Alex Ochoa, Craig House and Ross Gload on January 21, 2002.

New York Mets traded Lenny Harris, Alex Ochoa and Glendon Rusch to the Milwaukee Brewers for Jeromy Burnitz, Jeff D'Amico, Mark Sweeney and Lou Collier on January 21, 2002.

Milwaukee Brewers claimed Brady Clark of the New York Mets on waivers on January 21, 2003.

Milwaukee Brewers signed Ricky Bottalico of the New York Mets as a free agent on January 21, 2005.

New York Mets traded Kris Benson to the Baltimore Orioles for John Maine and Jorge Julio on January 21, 2006.

New York Mets signed free agent Blaine Boyer of the Arizona Diamondbacks on January 21, 2011.

New York Mets signed free agent Tim Byrdak of the Houston Astros on January 21, 2011.

New York Mets signed free agent Pedro Feliciano of the New York Yankees on January 21, 2013.

Boston Red Sox signed Dana Eveland of the New York Mets as a free agent on January 21, 2015.

Miami Marlins signed Zach Lutz of the New York Mets as a free agent on January 21, 2016.

Arizona Diamondbacks signed Wilmer Flores of the New York Mets as a free agent on January 21, 2019.