The 1920 St. Louis Cardinals season was the team's 39th season in St. Louis, Missouri and the 29th season in the National League. The Cardinals went 75–79 during the season and finished fifth in the National League.

Regular season

Rogers Hornsby became a full-time second baseman. Hornsby won the first of his seven batting titles with a .370 batting average, and he also led the league in on-base percentage (.431), slugging percentage (.559), hits (218), total bases (329), doubles (44), and RBI (94). From a fielding perspective, Hornsby led the league in putouts, assists, and double plays.

Season standings

Record vs. opponents

Roster

Player stats

Batting

Starters by position

''Note: Pos = Position; G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in''

Other batters

''Note: G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in''

Pitching

Starting pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts

Other pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts

Relief pitchers

Note: G = Games pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; SO = Strikeouts

Farm system