Offseason
- October 20, 1965: Charley Smith and Al Jackson were traded by the Mets to the St. Louis Cardinals for Ken Boyer.
- November 29, 1965: Al Luplow was purchased by the Mets from the Cleveland Indians.
- November 30, 1965: Joe Christopher was traded by the Mets to the Boston Red Sox for Eddie Bressoud.
- January 6, 1966: Gary Kroll was traded by the Mets to the Houston Astros for Johnny Weekly and cash.
Read more about this topic: 1966 New York Mets Season