2004 Oakland Athletics season

The Oakland Athletics' 2004 season involved the A's finishing second in the American League West with a record of 91 wins and 71 losses.

Offseason

 * October 9, 2003: Marco Scutaro was selected off waivers by the Oakland Athletics from the New York Mets.
 * November 18, 2003: Ted Lilly was traded by the Oakland Athletics to the Toronto Blue Jays for Bobby Kielty.
 * November 26, 2003: Mark Kotsay was traded by the San Diego Padres to the Oakland Athletics for Terrence Long and Ramón Hernández.
 * December 3, 2003: Wayne Gomes was signed as a free agent with the Oakland Athletics.
 * February 6, 2004: Eric Karros was signed as a free agent with the Oakland Athletics.
 * March 15, 2004: Mike Oquist was signed as a free agent with the Oakland Athletics.

Transactions

 * April 17, 2004: Kirk Saarloos was traded by the Houston Astros to the Oakland Athletics for Chad Harville.
 * August 3, 2004: Eric Karros was released by the Oakland Athletics.

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; IP = Innings pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned runs average; SO = Strikeouts

Farm system
LEAGUE CHAMPIONS: Sacramento, Modesto