The Florida Marlins' 2004 season started off with the team trying to improve on their season from 2003. Their manager was Jack McKeon. They played most of their home games at Pro Player Stadium.They played two against the Montreal Expos at Chicago's U.S. Cellular Field due to Hurricane Ivan. They finished with a record of 83-79, 3rd in the NL East.
- November 25, 2003: Derrek Lee was traded by the Florida Marlins to the Chicago Cubs for Hee-seop Choi and Mike Nannini (minors).
- December 4, 2003: Matt Treanor was signed as a Free Agent with the Florida Marlins.
Opening Day starters
- Josh Beckett
- Miguel Cabrera
- Luis Castillo
- Ramon Castro
- Hee-Seop Choi
- Jeff Conine
- Álex González
- Mike Lowell
- Juan Pierre
- May 6, 2004: Josías Manzanillo was signed as a Free Agent with the Florida Marlins.
- June 17, 2004: Billy Koch was traded by the Chicago White Sox to the Florida Marlins for Wilson Valdez and cash.
- July 30, 2004: Paul Lo Duca was traded by the Los Angeles Dodgers with Juan Encarnación and Guillermo Mota to the Florida Marlins for Hee-seop Choi, Brad Penny, and Bill Murphy.
- September 8, 2004: Dave Weathers was signed as a Free Agent with the Florida Marlins.
Note: G = Games played; AB = At Bats; R = Runs; H = Hits; Avg. = Batting Average; HR = Home Runs; RBI = Runs Batted In; SB = Stolen Bases
- ^ http://www.baseball-reference.com/l/leede02.shtml
- ^ http://www.baseball-reference.com/t/treanma01.shtml
- ^ http://baseball-almanac.com/teamstats/roster.php?y=2004&t=FLO
- ^ http://www.baseball-reference.com/players/m/manzajo01.shtml
- ^ http://www.baseball-reference.com/k/kochbi01.shtml
- ^ Paul Lo Duca Statistics - Baseball-Reference.com
- ^ http://www.baseball-reference.com/players/w/weathda01.shtml
- ^ http://www.baseball-reference.com/teams/FLA/2004.shtml
- ^ Johnson, Lloyd, and Wolff, Miles, ed., The Encyclopedia of Minor League Baseball, 3rd edition. Durham, N.C.: Baseball America, 2007