This is a list of the Philadelphia Phillies' baseball games played in September and October of the 2004 season, along with the opponent, date, time, and result of each game.
- September 1, 2004: vs. New York Mets - Phillies won 9-5
- September 3, 2004: vs. New York Mets - Phillies lost 1-2
- September 8, 2004: vs. Atlanta Braves - Phillies won 9-4
- September 10, 2004: vs. Cincinnati Reds - Phillies lost 4-7
- September 13, 2004: vs. Montreal Expos - Phillies won 12-8
- September 15, 2004: vs. Florida Marlins - Phillies lost 4-10
- September 17, 2004: vs. Montreal Expos - Phillies won 7-6
- September 19, 2004: vs. Florida Marlins - Phillies won 8-4
- September 21, 2004: vs. Pittsburgh Pirates - Phillies won 7-3
- September 23, 2004: vs. Florida Marlins - Phillies lost 4-3
- October 1, 2004: vs. Florida Marlins - Phillies won 4-1
- October 2, 2004: vs. Florida Marlins - Phillies lost 4-3 (this game was played in the NLDS against the New York Mets)
The Phillies finished the season with a record of 89-73, good for second place in the National League East division. Updated: September 19, 2025 at 8:36 PM