The 1989–90 Ball State Cardinals men's basketball team represented Ball State University as a member of the Mid-American Conference during the 1989–90 NCAA Division I men's basketball season. After the departure of head coach Rick Majerus, Ball State responded under new coach Dick Hunsaker by having the best season in the school's history. This group of Cardinals became the first team in the Mid-American Conference history to win two consecutive MAC regular season conference championships as well as back-to-back conference tournament titles. The 1990 Ball State basketball team also became the first team in the MAC to reach the Sweet 16 of the NCAA Tournament in its current format. The Cardinals lost in the Sweet 16 to the eventual national champions UNLV Runnin' Rebels, 69–67.