The 1990 LSU Tigers baseball team represented Louisiana State University in the 1990 NCAA Division I baseball season. The Tigers played their home games at Alex Box Stadium, and played as part of the Southeastern Conference. The team was coached by Skip Bertman in his seventh season as head coach at LSU.
The Tigers won the SEC, claimed a co-championship in the SEC Tournament after weather ended the championship game, then reached the College World Series, their fourth appearance in Omaha, where they finished 4th after a pair of wins against The Citadel and two losses to eventual runner-up Oklahoma State.