The 1989–90 Iowa State Cyclones men's basketball team represented Iowa State University during the 1989–90 NCAA Division I men's basketball season.
The Cyclones were coached by Johnny Orr, who was in his 10th season.
They played their home games at Hilton Coliseum in Ames, Iowa.
They lost to third-seeded Kansas in the 1990 Big Eight conference tournament quarterfinals.
They qualified for the NCAA tournament, losing to UCLA in the first round of the Southeast Regional.