The 1966 Chicago Cubs season was the 95th season of the Chicago Cubs franchise, the 91st in the National League and the 51st at Wrigley Field. The Cubs finished tenth and last in the National League with a record of 59–103, 36 games behind the NL Champion Los Angeles Dodgers. The Cubs would not lose 100 or more games in a season for another 46 seasons. One of the defining trades in Cubs history occurred on April 21, when the Cubs acquired future Cy Young Award winner Ferguson Jenkins in a trade with the Philadelphia Phillies.

Offseason

Regular season

Season standings

Record vs. opponents

Notable transactions

Roster

Player stats

Batting

Starters by position

''Note: 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

Farm system