1990 Southwest Conference men's basketball tournament

The 1990 Southwest Conference men's basketball tournament was held March 10–0, 1990, at Reunion Arena in Dallas, Texas.

Number 1 seed Arkansas defeated 2 seed Houston 96-84 to win their 5th championship and receive the conference's automatic bid to the 1990 NCAA tournament.

Format and seeding
The tournament consisted of the top 8 teams playing in a single-elimination tournament.