1915 St. Louis Cardinals season

The 1915 St. Louis Cardinals season was the team's 34th season in St. Louis, Missouri and the 24th season in the National League. The Cardinals went 72–81 during the season and finished sixth in the National League. The legendary Rogers Hornsby made his National League debut on September 10.

Notable transactions

 * September 12, 1915: Jim Brown was acquired by the Cardinals from the Topeka Jayhawks.

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''

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