The 2003 LSU Tigers baseball team represented Louisiana State University in the 2003 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 Smoke Laval in his second season as head coach at LSU.
The Tigers won the SEC, claimed the championship in the SEC Tournament, then won the Baton Rouge Regional and Super Regional to reach the College World Series, their twelfth appearance in Omaha, where were eliminated after a pair of losses to Cal State Fullerton and .