The 1988 NCAA Division I Baseball Tournament was played at the end of the 1988 NCAA Division I baseball season to determine the national champion of college baseball. The tournament concluded with eight teams competing in the College World Series, a double-elimination tournament in its forty-second year. Eight regional competitions were held to determine the participants in the final event. Each region was composed of six teams, resulting in 48 teams participating in the tournament at the conclusion of their regular season, and in some cases, after a conference tournament. The forty-second tournament’s champion was Stanford coached by Mark Marquess. The Most Outstanding Player was Lee Plemel of Stanford.