1990 Pittsburgh Pirates season

The 1990 Pittsburgh Pirates season was their 109th season; the 104th in the National League. This was their 21st season at Three Rivers Stadium. The Pirates finished first in the National League East with a record of 95–67. They were defeated four games to two by the Cincinnati Reds in the NLCS.

Offseason

 * December 4, 1989: Gordon Dillard was drafted by the Pirates from the Philadelphia Phillies in the 1989 rule 5 draft.
 * January 14, 1990: Mark Ross was signed as a free agent by the Pirates.
 * January 31, 1990: Wally Backman was signed as a free agent by the Pirates.

Regular season

 * Barry Bonds became the first Major Leaguer in history to have a .300 batting average, 100 RBI, 100 runs and 50 stolen bases in the same season. With 33 home runs, he became the second to have 30 home runs and 50 steals in a season, following Cincinnati's Eric Davis in 1987.

Game log

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

Awards and honors

 * Barry Bonds, OF, National League Most Valuable Player Award
 * Sid Bream, Hutch Award
 * Sid Bream, National League Record, Most Assists in One Season,
 * Doug Drabek, National League Cy Young Award
 * Doug Drabek, National League Pitcher of the Month, July
 * Doug Drabek, National League Pitcher of the Month, August
 * Jim Leyland, National League Manager of the Year Award
 * Andy Van Slyke, Outfield, Gold Glove Award

1990 Major League Baseball All-Star Game
 * Barry Bonds, OF, reserve
 * Bobby Bonilla, OF, reserve
 * Neal Heaton, P, reserve

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

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

Notable transactions

 * May 2, 1990: Rico Rossy was traded by the Pirates to the Atlanta Braves for Greg Tubbs.
 * May 18, 1990: Roger Mason was signed as a free agent with the Pittsburgh Pirates.
 * June 5, 1990: The Pirates traded a player to be named later to the Baltimore Orioles for Jay Tibbs. The Pirates completed the deal by sending Dorn Taylor to the Orioles on September 5.
 * August 8, 1990: Scott Ruskin, Willie Greene and a player to be named later were traded by the Pirates to the Montreal Expos for Zane Smith. The Pirates completed the trade by sending Moisés Alou to the Expos on August 16.
 * September 1, 1990: Randy Kramer was traded by the Pirates to the Chicago Cubs for Greg Kallevig (minors).

Farm system
LEAGUE CHAMPIONS: DSL Pirates