1965–66 Indiana Hoosiers men's basketball team

The 1965–66 Indiana Hoosiers men's basketball team represented Indiana University. Their head coach was Lou Watson, who was in his 1st year. The team played its home games in New Fieldhouse in Bloomington, Indiana, and was a member of the Big Ten Conference.

The Hoosiers finished the regular season with an overall record of 8–16 and a conference record of 4–10, finishing 9th in the Big Ten Conference. Indiana was not invited to participate in any postseason tournament.

Schedule/Results
!colspan=8| Regular Season