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

Regular season

Opening Day starters

Season standings

National League Central

Record vs. opponents

Transactions

Game log

Roster

Player stats

Batting

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''

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