- New York Mets sold Don Bosch to the Montreal Expos on October 16, 1968.
- New York Mets traded Kevin Collins, Steve Renko, Jay Carden and Dave Colon to the Montreal Expos for Donn Clendenon on June 15, 1969.
- New York Mets traded Ron Swoboda and Rich Hacker to the Montreal Expos for Don Hahn on March 31, 1971.
- New York Mets sold Ron Taylor to the Montreal Expos on October 20, 1971.
- New York Mets traded Arsenio Diaz, Billy Carthel, Curtis Brown and Don Koonce to the Montreal Expos for Jim Gosger on December 3, 1971.
- New York Mets traded Tim Foli, Mike Jorgensen and Ken Singleton to the Montreal Expos for Rusty Staub on April 6, 1972.
- New York Mets purchased John Strohmayer from the Montreal Expos on July 16, 1973.
- New York Mets traded Wayne Garrett and Del Unser to the Montreal Expos for Pepe Mangual and Jim Dwyer on July 21, 1976.
- New York Mets sold Dale Murray to the Montreal Expos on August 30, 1979.
- Montreal Expos signed Ray Burris of the New York Mets as a free agent on February 18, 1981.
- New York Mets traded Dan Norman and Jeff Reardon to the Montreal Expos for Ellis Valentine on May 29, 1981.
- New York Mets traded Frank Taveras to the Montreal Expos for Steve Ratzer on December 11, 1981.
- New York Mets traded Joel Youngblood to the Montreal Expos for Tom Gorman on August 4, 1982.
- New York Mets traded Hubie Brooks, Mike Fitzgerald, Herm Winningham and Floyd Youmans to the Montreal Expos for Gary Carter on December 10, 1984.
- Montreal Expos signed Bruce Berenyi of the New York Mets as a free agent on January 23, 1987.
- New York Mets traded Steve Frey to the Montreal Expos for Tom O'Malley and Mark Bailey on March 28, 1989.
- Montreal Expos claimed Orlando Mercado of the New York Mets on waivers on August 30, 1990.
- New York Mets traded Ron Darling and Mike Thomas to the Montreal Expos for Tim Burke on July 15, 1991.
- New York Mets claimed Junior Noboa on waivers from the Montreal Expos on October 8, 1991.
- New York Mets traded Blaine Beatty to the Montreal Expos for Jeff Barry on December 9, 1991.
- Montreal Expos signed Rick Cerone of the New York Mets as a free agent on February 12, 1992.
- New York Mets traded Doug Simons to the Montreal Expos for Rob Katzaroff on April 2, 1992.
- New York Mets traded David Segui to the Montreal Expos for Reid Cornelius on June 8, 1995.
- New York Mets signed free agent Steve Bieser of the Montreal Expos on November 21, 1996.
- New York Mets selected Guillermo Mota in free agent draft on December 9, 1996.
- New York Mets signed free agent Ryan McGuire of the Montreal Expos on December 13, 1999.
- Montreal Expos claimed Endy Chavez of the New York Mets on waivers on February 22, 2002.
- New York Mets traded Lou Collier to the Montreal Expos for Jason Bay and Jimmy Serrano on March 24, 2002.
- New York Mets traded Bruce Chen, Dicky Gonzalez and Luis Figueroa to the Montreal Expos for Scott Strickland, Matt Watson and Phil Seibel on April 5, 2002.
- New York Mets signed free agent Todd Zeile of the Montreal Expos on January 28, 2004.
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