1931 Pittsburgh Pirates season

The 1931 Pittsburgh Pirates season was the 50th season of the Pittsburgh Pirates franchise; the 45th in the National League. The Pirates finished fifth in the league standings with a record of 75–79.

Offseason

 * November 6, 1930: Dick Bartell was traded by the Pirates to the Philadelphia Phillies for Tommy Thevenow and Claude Willoughby.

Notable transactions

 * June 13, 1931: Rollie Hemsley was traded by the Pirates to the Chicago Cubs for Earl Grace.

Game log

 * Legend:      = Win       = Loss       = Tie Bold = Pirates team member
 * Legend:      = Win       = Loss       = Tie Bold = Pirates team member

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