| Postseason: |
Lost World Series (4-0) to Boston Red Sox Won NL Championship Series (4-3) over Houston Astros Won NL Division Series (3-1) over Los Angeles Dodgers |

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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 7, 2003
Steve Torrealba granted Free Agency.
October 15, 2003
Matt Duff granted Free Agency.
Todd Dunwoody granted Free Agency.
Bucky Jacobsen granted Free Agency.
Gabe Molina granted Free Agency.
Jon Nunnally granted Free Agency.
Kevin Ohme granted Free Agency.
October 26, 2003
Miguel Cairo granted Free Agency.
Joe Girardi granted Free Agency.
Orlando Palmeiro granted Free Agency.
Eduardo Perez granted Free Agency.
Brett Tomko granted Free Agency.
October 27, 2003
Cal Eldred granted Free Agency.
Steve Kline granted Free Agency.
Chris Widger granted Free Agency.
October 28, 2003
Russ Springer granted Free Agency.
October 31, 2003
Sterling Hitchcock granted Free Agency.
November 2, 2003
Jeff Fassero granted Free Agency.
November 3, 2003
Chris Carpenter granted Free Agency.
Signed Allen Levrault as a free agent.
Fernando Vina granted Free Agency.
November 5, 2003
Signed Cody McKay as a free agent.
November 6, 2003
Signed Joe Horgan as a free agent.
November 7, 2003
Mike DeJean granted Free Agency.
Signed Mike Mahoney as a free agent.
November 19, 2003
Signed Kevin Witt as a free agent.
November 20, 2003
Signed Randy Flores as a free agent.
November 21, 2003
Traded Tino Martinez to the Tampa Bay Devil Rays. Received a player to be named later and Evan Rust (minors). The Tampa Bay Devil Rays sent John-Paul Davis (minors) (December 16, 2003) to the St. Louis Cardinals to complete the trade.
November 24, 2003
Signed Chad Paronto as a free agent.
December 2, 2003
Signed Chris Carpenter as a free agent.
December 4, 2003
Signed Chris Widger as a free agent.
December 7, 2003
Signed Cal Eldred as a free agent.
Signed Steve Kline as a free agent.
December 9, 2003
Signed Brent Butler as a free agent.
December 13, 2003
Traded J.D. Drew and Eli Marrero to the Atlanta Braves. Received Ray King, Jason Marquis and Adam Wainwright.
December 15, 2003
Drafted Hector Luna from the Cleveland Indians in the 2003 rule 5 draft.
December 18, 2003
Signed Jeff Suppan as a free agent.
December 19, 2003
Signed Reggie Sanders as a free agent.
December 24, 2003
Signed Luis Ortiz as a free agent.
December 25, 2003
Signed Matt Duff as a free agent.
December 30, 2003
Signed Mark Quinn as a free agent.
January 7, 2004
Signed Chris Prieto as a free agent.
January 8, 2004
Signed Lou Pote as a free agent.
January 9, 2004
Signed Marlon Anderson as a free agent.
Signed Mike Lincoln as a free agent.
Signed Julian Tavarez as a free agent.
January 10, 2004
Signed Alan Benes as a free agent.
January 12, 2004
Signed Wilson Delgado as a free agent.
Signed Randy Ruiz as a free agent.
January 18, 2004
Signed Emil Brown as a free agent.
January 22, 2004
Selected Colin Porter off waivers from the Houston Astros.
February 12, 2004
Signed John Mabry as a free agent.
February 18, 2004
Signed Doug Creek as a free agent.
Signed Ray Lankford as a free agent.
February 23, 2004
Selected Luis Martinez off waivers from the Milwaukee Brewers.
March 18, 2004
Released Brent Butler.
March 21, 2004
Traded Matt Duff to the Boston Red Sox. Received Tony Womack.
March 26, 2004
Released Randy Ruiz.
March 28, 2004
Released Allen Levrault.
March 29, 2004
Traded Kerry Robinson to the San Diego Padres. Received Brian Hunter.
April 1, 2004 (Standings)
Released Mark Quinn.
April 4, 2004 (Standings)
Traded Wilson Delgado to the New York Mets. Received Roger Cedeno.
April 7, 2004 (Standings)
Released Chris Widger.
May 2, 2004 (Standings)
Released Emil Brown.
May 7, 2004 (Standings)
Traded Joe Horgan to the Montreal Expos. Received Benji DeQuin (minors).
May 26, 2004 (Standings)
Sold Lou Pote to the Cleveland Indians.
May 29, 2004 (Standings)
Released Brian Hunter.
June 1, 2004 (Standings)
Signed Mark Quinn as a free agent.
June 6, 2004 (Standings)
Signed Al Reyes as a free agent.
June 7, 2004 (Standings)
Drafted Chris Lambert in the 1st round (19th pick) of the 2004 amateur draft. Player signed June 30, 2004.
Drafted Jarrett Hoffpauir in the 6th round of the 2004 amateur draft. Player signed June 23, 2004.
Drafted Mike Parisi in the 9th round of the 2004 amateur draft. Player signed June 24, 2004.
Drafted Mark Worrell in the 12th round of the 2004 amateur draft. Player signed June 29, 2004.
June 15, 2004 (Standings)
Received Nerio Rodriguez from the New York Yankees as part of a conditional deal.
June 16, 2004 (Standings)
Signed Cory Doyne as a free agent.
July 15, 2004 (Standings)
Released Jason Pearson.
July 21, 2004 (Standings)
Sent Jason Ryan to the Kansas City Royals as part of a conditional deal.
July 27, 2004 (Standings)
Received Armando Rios from the Baltimore Orioles as part of a conditional deal.
July 28, 2004 (Standings)
Released Luis Ortiz.
August 2, 2004 (Standings)
Signed Tim Young as a free agent.
August 6, 2004 (Standings)
Traded players to be named later and Jason Burch (minors) to the Colorado Rockies. Received Larry Walker. The St. Louis Cardinals sent Luis Martinez (August 11, 2004) and Chris Narveson (August 11, 2004) to the Colorado Rockies to complete the trade.
August 17, 2004 (Standings)
Signed Danny Patterson as a free agent.
Signed Steve Woodard as a free agent.
August 23, 2004 (Standings)
Released Armando Rios.
October 15, 2004 (Standings)
Alan Benes granted Free Agency.
Doug Creek granted Free Agency.
Mike Mahoney granted Free Agency.
Chad Paronto granted Free Agency.
Danny Patterson granted Free Agency.
Colin Porter granted Free Agency.
Chris Prieto granted Free Agency.
Mark Quinn granted Free Agency.
Nerio Rodriguez granted Free Agency.
Steve Stemle granted Free Agency.
Kevin Witt granted Free Agency.
Steve Woodard granted Free Agency.
Tim Young granted Free Agency.
October 29, 2004
Ray Lankford granted Free Agency.
Mike Matheny granted Free Agency.
Edgar Renteria granted Free Agency.
November 1, 2004
Steve Kline granted Free Agency.
Matt Morris granted Free Agency.
Tony Womack granted Free Agency.
November 2, 2004
Cal Eldred granted Free Agency.
November 3, 2004
John Mabry granted Free Agency.
November 4, 2004
Woody Williams granted Free Agency.
November 16, 2004
Signed Toby Borland as a free agent.
November 19, 2004
Signed Brandon Berger as a free agent.
Signed Mike Mahoney as a free agent.
Released Jason Simontacchi.
November 22, 2004
Signed Mike Bell as a free agent.
November 24, 2004
Released Marlon Anderson.
December 1, 2004
Signed Chris Gissell as a free agent.
December 7, 2004
Signed Cal Eldred as a free agent.
Signed John Mabry as a free agent.
Signed Matt Morris as a free agent.
December 13, 2004
Tyler Johnson drafted by the Oakland Athletics in the 2004 rule 5 draft.
December 14, 2004
Signed Einar Diaz as a free agent.
December 18, 2004
Traded Daric Barton, Kiko Calero and Danny Haren to the Oakland Athletics. Received Mark Mulder.
December 21, 2004
So Taguchi granted Free Agency.
December 22, 2004
Signed Mike Myers as a free agent.
Signed So Taguchi as a free agent.
December 23, 2004
Signed David Eckstein as a free agent.
Signed Raul Gonzalez as a free agent.
December 28, 2004
Signed Abraham Nunez as a free agent.
January 6, 2005
Signed Mark Grudzielanek as a free agent.
January 12, 2005
Signed Bob File as a free agent.
January 18, 2005
Signed Nerio Rodriguez as a free agent.
January 20, 2005
Signed Wilton Guerrero as a free agent.
January 26, 2005
Signed Pete Zoccolillo as a free agent.
February 2, 2005
Signed Hector Mercado as a free agent.
February 19, 2005
Signed Kevin Jarvis as a free agent.
February 21, 2005
Signed Bill Pulsipher as a free agent.
March 22, 2005
The Oakland Athletics returned Tyler Johnson (earlier draft pick).
March 28, 2005
Released Hector Mercado.
March 29, 2005
Traded Mike Myers to the Boston Red Sox. Received Carlos De La Cruz (minors) and Kevin Ool (minors).
March 30, 2005
Released Wilton Guerrero.