The 1989–90 Robert Morris Colonials men's basketball team represented Robert Morris University in the 1989–90 NCAA Division I basketball season. Robert Morris was coached by Jarrett Durham and played their home games at the Charles L. Sewall Center in Moon Township, Pennsylvania. The Colonials were members of the Northeast Conference. They finished the season 22–8, 12–4 in NEC play. They won the 1990 Northeast Conference Men's Basketball Tournament to earn the conference's automatic bid to the 1990 NCAA Men's Division I Basketball Tournament. They earned a 15 seed in the East Region and played No. 2 seed Kansas in the first round. The Colonials played a tough game, but were beaten 79–71 to end their season.