Offseason
- October 14, 1974: Marc Hill was traded by the Cardinals to the San Francisco Giants for Ken Rudolph and Elías Sosa.
- November 18, 1974: Alan Foster, Rich Folkers and Sonny Siebert were traded by the Cardinals to the San Diego Padres as part of a three team trade. The Padres sent a player to be named later to the Cardinals, and the Detroit Tigers sent Ed Brinkman to the Cardinals. The Tigers sent Bob Strampe and Dick Sharon to the Padres. The Padres sent Nate Colbert to the Tigers. The Padres completed the deal by sending Danny Breeden to the Cardinals on December 12.
- March 26, 1975: Ron Hunt was released by the Cardinals.
- March 29, 1975: Danny Godby was traded by the Cardinals to the Boston Red Sox for Danny Cater.
Read more about this topic: 1975 St. Louis Cardinals Season