Offseason
- October 5, 1970: Dick Allen was traded by the Cardinals to the Los Angeles Dodgers for Ted Sizemore and Bob Stinson.
- October 20, 1970: Carl Taylor and Jim Ellis were traded by the Cardinals to the Milwaukee Brewers for Jerry McNertney, George Lauzerique, and Jesse Huggins (minors).
Read more about this topic: 1971 St. Louis Cardinals Season