2018 NCAA Division III baseball tournament
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, who defeated in the championship series in two games.
This was the final DIII World Series contested with the current regional format and World Series location.
Bids
Automatic bids
Source: NCAA| School | Conference | Last NCAA Appearance |
| AMCC | 2017 (Mideast Regional) | |
| ASC | 2007 (West Regional) | |
| CAC | 2017 (South Regional) | |
| Centennial | 1985 (Mid-Atlantic Regional) | |
| CCIW | 2017 College World Series | |
| CSAC | 2017 (Mideast Regional) | |
| CCC | 2013 (New England Regional) | |
| Empire 8 | 2017 (New York Regional) | |
| Great Northeast | 2017 (New England Regional) | |
| HCAC | 2011 (Mideast Regional) | |
| IIAC | First appearance | |
| Landmark | 2015 (Mid-Atlantic Regional) | |
| Liberty | 2016 (New York Regional) | |
| Little East | 2017 College World Series | |
| MASCAC | 2010 (New England Regional) | |
| MIAA | 2017 (Midwest Regional) | |
| MAC Commonwealth | 2017 (New England Regional) | |
| MAC Freedom | 2017 (Mideast Regional) | |
| MWC | 2002 (Central Regional) | |
| MIAC | First appearance | |
| NECC | 2016 (New England Regional) | |
| NESCAC | 2015 (New York Regional) | |
| NEWMAC | 2017 (New England Regional) | |
| NJAC | 2017 (South Regional) | |
| NAC | 2017 (New York Regional) | |
| NCAC | 2011 (South Regional) | |
| NEAC | 2017 (New England Regional) | |
| NACC | 2012 (Midwest Regional) | |
| NWC | First appearance | |
| OAC | 2015 (New York Regional) | |
| ODAC | 2017 (Mid-Atlantic Regional) | |
| PAC | 2016 (South Regional) | |
| Skyline | 2016 (Mideast Regional) | |
| SLIAC | 2017 (Central Regional) | |
| SAA | 2017 (West Regional) | |
| SCIAC | 2011 College World Series Runner-up | |
| SCAC | 2013 (West Regional) | |
| SUNYAC | 2017 World Series | |
| USA South | 2017 (South Regional) | |
| UMAC | First appearance |