1978 NCAA Division III baseball tournament

The 1978 NCAA Division III baseball tournament was played at the end of the 1978 NCAA Division III baseball season to determine the third national champion of college baseball at the NCAA Division III level. The tournament concluded with four teams competing at Pioneer Park in Marietta, Ohio, for the championship. Four regional tournaments were held to determine the participants in the World Series. Regional tournaments were contested in double-elimination format, with all four regions consisting of six teams, for a total of 24 teams participating in the tournament, up from 22 in 1977. The tournament champion was, who defeated for the championship.

Bids
The 24 competing teams were:

Regionals
Bold indicates winner.

Bracket
Pioneer Park-Marietta, OH (Host: Marietta College)