1891 St. Louis Browns season

The 1891 St. Louis Browns season was the team's tenth season in St. Louis, Missouri and the tenth season in the American Association. The Browns went 85–51 during the season and finished second in the American Association.

This was the Browns final season in the American Association. The league folded after the season, and the Browns moved to the National League where they remain today as the St. Louis Cardinals.

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