The 2004–05 NCAA Division I men's basketball season began on November 10, 2004, progressed through the regular season and conference tournaments, and concluded with the 2005 NCAA Division I men's basketball tournament championship game on April 4, 2005, at the Edward Jones Dome in Saint Louis, Missouri.

The North Carolina Tar Heels won their fourth NCAA national championship with a 75–70 victory over the Illinois Fighting Illini.

The NCAA Tournament tipped off on March 15, 2005 with the opening round game in Dayton, Ohio, and concluded on April 4 at the Edward Jones Dome in St. Louis, MO.

The automatic bid of the Ivy League, which does not conduct a post-season tournament, went to its regular season champion.

Dave Odom's South Carolina Gamecocks won the title, defeating the Saint Joseph's Hawks 60–57 in the championship game.