1990 Southwest Conference baseball tournament

The 1990 Southwest Conference baseball tournament was the league's annual postseason tournament used to determine the Southwest Conference's (SWC) automatic bid to the 1990 NCAA Division I baseball tournament. The tournament was held from May 17 through 19 at Disch–Falk Field on the campus of The University of Texas in Austin, Texas.

The number 2 seed went 3–0 to win the team's 9th SWC tournament under head coach Cliff Gustafson.

Format and seeding
The tournament featured the top four finishers of the SWC's 8 teams in a double-elimination tournament.