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 2nd to the Pittsburgh Pirates in the National League East division 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.
- October 11, 1990: Ernie Camacho was released by the St. Louis Cardinals.
Opening Day starters
- Bernard Gilkey
- Pedro Guerrero
- Felix Jose
- Ray Lankford
- Jose Oquendo
- Tom Pagnozzi
- Ozzie Smith
- Bob Tewksbury
- Todd Zeile 
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.
Note: G = Games played; AB = At Bats; H = Hits; Avg. = Batting Average; HR = Home Runs; RBI = Runs Batted In
Awards and honors
- Tom Pagnozzi, Catcher, National League Gold Glove
- Ozzie Smith, Shortstop, National League Gold Glove
- ^ http://www.baseball-reference.com/c/camacer01.shtml
- ^ http://www.baseball-almanac.com/teamstats/roster.php?y=1991&t=SLN
- ^ John Mabry Statistics - Baseball-Reference.com
- ^ Johnson, Lloyd, and Wolff, Miles, ed., The Encyclopedia of Minor League Baseball, 2nd and 3rd editions. Durham, N.C.: Baseball America, 1997 and 2007