2003 Cincinnati Reds season

The 2003 Cincinnati Reds season was the 134th season for the franchise in Major League Baseball, and their first season at Great American Ball Park in Cincinnati. They failed to improve on their 78–84 record from 2002.

Offseason

 * November 18, 2002: Ryan Freel was signed as a free agent by the Reds.
 * December 15, 2002: Elmer Dessens and cash were traded by the Reds to the Arizona Diamondbacks as part of a 4-team trade. The Toronto Blue Jays sent Felipe López to the Reds. The Diamondbacks sent Erubiel Durazo to the Oakland Athletics. The Athletics sent a player to be named later to the Blue Jays. The Athletics completed the deal by sending Jason Arnold (minors) to the Blue Jays on December 16.
 * January 22, 2003: Josías Manzanillo was signed as a free agent with the Cincinnati Reds.

Season summary
The Reds finished in fifth place in their division, nineteen games behind the division winner, the Chicago Cubs. They finished with a record of 69-93 and a winning percentage of .421. The Reds finished eighteen games behind the second place team, the Houston Astros. They finished sixteen games behind the third place team, the St. Louis Cardinals. They finished six games behind the fourth place team, the Pittsburgh Pirates, and one game ahead of the sixth place team, the Milwaukee Brewers.

In the middle of the season, the Reds fired manager Bob Boone and promoted Louisville Bats manager Dave Miley to interim manager.

Notable transactions

 * July 30, 2003: José Guillén was traded by the Reds to the Oakland Athletics for Aaron Harang, Joe Valentine, and Jeff Bruksch (minors).
 * August 24, 2003: Scott Service was signed as a free agent by the Reds.

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

Farm system
LEAGUE CHAMPIONS: Billings