1990 Cal State Fullerton Titans baseball team

The 1990 Cal State Fullerton Titans baseball team represented California State University, Fullerton in the 1990 NCAA Division I baseball season. The Titans played their home games at Titan Field, and played as part of the Big West Conference. The team was coached by Larry Cochell in his third season as head coach at Cal State Fullerton.

The Titans reached the College World Series, their sixth appearance in Omaha, where they finished tied for seventh place after losing games to eventual runner-up Oklahoma State and The Citadel.