1980 Milwaukee Brewers season

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.

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.

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

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.