The 2003–04 NCAA Division I men's basketball season began on November 10, 2003, progressed through the regular season and conference tournaments, and concluded with the 2004 NCAA Men's Division I Basketball Tournament Championship Game on April 5, 2004, at the Alamodome in San Antonio, Texas. The Connecticut Huskies won their second NCAA national championship with an 82–73 victory over the Georgia Tech Yellow Jackets.

Season headlines

Major rule changes

Beginning in 2003–04, the following rules changes were implemented:

Season outlook

Pre-season polls

The top 25 from the AP and ESPN/USA Today Coaches Polls November 13, 2003.

Conference membership changes

These schools joined new conferences for the 2003–04 season.

Regular season

Conferences

Conference winners and tournaments

Conference standings

Division I independents

Four schools played as Division I independents.

Informal championships

Saint Joseph's finished with a 4–0 record in head-to-head competition among the Philadelphia Big 5.

Statistical leaders

Source for additional stats categories

Postseason tournaments

NCAA tournament

Final Four – Alamodome, San Antonio, Texas

National Invitation tournament

Semifinals & finals

Award winners

Consensus All-American teams

Major player of the year awards

Major freshman of the year awards

Major coach of the year awards

Other major awards

Coaching changes

A number of teams changed coaches throughout the season and after the season ended.