The 1920 Cleveland Indians season was the 20th season in franchise history. The Indians won the American League pennant and proceeded to win their first World Series title in the history of the franchise. Pitchers Jim Bagby, Stan Coveleski and Ray Caldwell combined to win 75 games. Despite the team's success, the season was perhaps more indelibly marked by the death of starting shortstop Ray Chapman, who died after being hit by a pitch on August 16.

The 1920 Major League Baseball season began on April 14, 1920. The regular season ended on October 3, with the Brooklyn Robins and Cleveland Indians as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 17th World Series on October 5 and ended with Game 7 on October 12. The Indians defeated the Robins, five games to two.