2018 Horizon League baseball tournament

The 2018 Horizon League baseball tournament was held from May 23 through 26. All six of the league's teams met in the double-elimination tournament to be held at the home field of the regular season champion, which was Wright State. The winner of the tournament earned the conference's automatic bid to the 2018 NCAA Division I baseball tournament.

Seeding and format
The league's teams were seeded one through six based on winning percentage, using conference games only. The bottom four seeds participated in a play-in round, with winners advancing to a double-elimination tournament also including the top two seeds.