| Postseason: |
Lost World Series (5-2) to Cleveland Indians |

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Transactions listed are from November 1 of previous year to April 1 of the following year.
January 12, 1920
Sold Mack Wheat to the Philadelphia Phillies.
March, 1920
Purchased Bill Lamar from the Boston Red Sox.
May 22, 1920 (Standings)
Purchased Bill McCabe from the Chicago Cubs.
July, 1920 (Standings)
Sold Wally Hood to the Pittsburgh Pirates.
July 27, 1920 (Standings)
Sold Doug Baird to the New York Giants.
December 15, 1920
Traded Rube Marquard to the Cincinnati Reds. Received Dutch Ruether.