2003 St. Louis Cardinals season

The St. Louis Cardinals 2003 season was the team's 122nd season in St. Louis, Missouri and the 112th season in the National League. The Cardinals went 85–77 during the season and finished third in the National League Central, three games behind the Chicago Cubs, who won the NL Central at 88–74, and two behind the NL Central runners-up, the Houston Astros (87–75).

Catcher Mike Matheny, shortstop Édgar Rentería, third baseman Scott Rolen, and outfielder Jim Edmonds won Gold Gloves this year.

Offseason

 * December 13, 2002: Chris Carpenter was signed as a free agent with the St. Louis Cardinals.

Opening Day starters

 * Jim Edmonds
 * Eli Marrero
 * Tino Martinez
 * Mike Matheny
 * Matt Morris
 * Albert Pujols
 * Édgar Rentería
 * Scott Rolen
 * Fernando Viña

Transactions

 * May 27, 2003: Scott Seabol was signed as a free agent with the St. Louis Cardinals.

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