The 2018 NCAA Division III Baseball Tournament was played at the end of the 2018 NCAA Division III baseball season to determine the 43rd national champion of college baseball at the NCAA Division III level. The tournament concluded with eight teams competing at Neuroscience Group Field at Fox Cities Stadium in Grand Chute, Wisconsin for the championship. Eight regional tournaments were held to determine the participants in the World Series. Regional tournaments were contested in double-elimination format, with three regions consisting of six teams, and five consisting of eight, for a total of 58 teams participating in the tournament, up from 56 in 2017. The tournament champion was Texas-Tyler, who defeated Texas Lutheran in the championship series in two games.