The 1984 NCAA Division II men's basketball tournament involved 32 schools playing in a single-elimination tournament to determine the national champion of men's NCAA Division II college basketball as a culmination of the 1983-4 NCAA Division II men's basketball season. It was won by Central Missouri State (now known as the University of Central Missouri) and Central Missouri State's Ron Nunnally was the Most Outstanding Player. San Francisco State's participation in the tournament was later vacated by the NCAA.