1959 Pittsburgh Pirates season

The 1959 Major League Baseball season saw the Pittsburgh Pirates finish in fourth place in the National League at 78–76, nine games behind the NL and World Series Champion Los Angeles Dodgers. The Pirates set the record for most extra innings victories in a season, winning 19 of their 21 extra inning games.

Offseason

 * January 30, 1959: Whammy Douglas, Jim Pendleton, Frank Thomas, and John Powers were traded by the Pirates to the Cincinnati Reds for Smoky Burgess, Harvey Haddix and Don Hoak.
 * Prior to 1959 season: Dick Rand was traded by the Pirates to the St. Louis Cardinals for Tom Burgess.

Regular season

 * May 26, 1959: Harvey Haddix took a perfect game into the 13th inning of a game against the Milwaukee Braves. Haddix retired 36 consecutive batters in 12 innings, but lost the game 1–0. Braves pitcher Lew Burdette also pitched a shutout for 13 full innings, giving up 12 hits. NOTE: On September 4, 1991, MLB redefined no-hitters to no longer include games in which the first hit was surrendered in extra innings. Until then, Haddix had been credited with a perfect game.

Game log

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

Notable transactions

 * May 29, 1959: Gene Baker was released by the Pirates.
 * June 13, 1959: Bob Smith was selected off waivers from the Pirates by the Detroit Tigers.

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

Records

 * Roy Face, major league record, most wins in one season by a relief pitcher (18)
 * Harvey Haddix, major league record, Most consecutive batters retired in one game (36)

Farm system
LEAGUE CHAMPIONS: Salt Lake City, Gastonia, Wilson Columbus (GA) franchise transferred to Gastonia, May 26, 1959; San Angelo franchise transferred to Roswell, June 9, 1959