The 1980 Milwaukee Brewers season involved the Brewers' finishing third in the American League East with a record of 86 wins and 76 losses. The Brewers led MLB in home runs (203), grand slams (8), runs batted in (774), slugging percentage (.448), on-base plus slugging (.777) and OPS+ (114).
Offseason
October 11, 1979: Juan Castillo was signed as an amateur free agent by the Brewers. December 6, 1979: Lenn Sakata was traded by the Brewers to the Baltimore Orioles for John Flinn.
Regular season
Season standings
Record vs. opponents
Notable transactions
April 3, 1980: Ray Fosse was released by the Brewers. July 24, 1980: Bill Lyons was signed as an amateur free agent by the Brewers. September 1, 1980: John Poff was selected off waivers by the Brewers from the Philadelphia Phillies.
Roster
Player stats
Batting
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
Pitching
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
Awards and honors
Cecil Cooper, Silver Slugger Award, first base
Farm system
The Brewers' farm system consisted of five minor league affiliates in 1980. The Holyoke Millers won the Eastern League championship, and the Stockton Ports won the California League championship.