The 1989–90 NCAA Division I men's basketball season began in November 1989 and ended with the Final Four at McNichols Sports Arena in Denver, Colorado on April 2, 1990.

The UNLV Runnin' Rebels won their first NCAA national championship with a 103–73 victory over the Duke Blue Devils.

[6] A total of 19 college teams played as Division I independents.

[14] La Salle finished with a 4–0 record in head-to-head competition among the Philadelphia Big 5.

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