The St. Louis Cardinals 1991 season was the team's 110th season in St. Louis, Missouri and the 100th season in the National League. The Cardinals rebounded from a rare last-place finish a year earlier to register a record of 84–78 during the season and finished second to the Pittsburgh Pirates in the National League East by fourteen games. Ozzie Smith set the National League record for fewest errors in a season by a shortstop with 8 errors. Gold Gloves were awarded to catcher Tom Pagnozzi and shortstop Ozzie Smith this year.

Offseason

Regular season

Opening Day starters

Season standings

Record vs. opponents

Transactions

June 3, 1991: John Mabry was drafted by the St. Louis Cardinals in the 6th round of the 1991 amateur draft. Player signed June 11, 1991.

Roster

Player stats

Batting

''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

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

Farm system