The 1903–04 collegiate men's basketball season in the United States began in December 1903, progressed through the regular season, and concluded in March 1904.
NOTE: The Western Conference (the future Big Ten Conference) did not sponsor an official conference season or recognize a regular-season champion until the 1905–06 season.
In 1903–04, Chicago (7–0) finished with the best winning percentage (1.000) and Purdue (11–2) and Wisconsin (11–4) with the most wins.
A total of 56 college teams played as major independents.
Among teams that played at least 10 games, North Dakota Agriultural (11–1) had the best winning percentage (.917), and Fordham (19–5) won the most games.