Offseason
- October 20, 1955: Harry Walker was released by the Cardinals.
- November 27, 1955: Ed Mayer was drafted by the Cardinals from the Boston Red Sox in the 1955 minor league draft.
- November 27, 1955: Billy Muffett was drafted by the Cardinals from the Chicago Cubs in the 1955 rule 5 draft.
- January 31, 1956: Brooks Lawrence and Sonny Senerchia were traded by the Cardinals to the Cincinnati Redlegs for Jackie Collum.
- March 30, 1956: Pete Whisenant was traded by the Cardinals to the Chicago Cubs for Hank Sauer.
Read more about this topic: 1956 St. Louis Cardinals Season