The 2018 Horizon League men's basketball tournament (also known as Motor City Madness) was the postseason men's basketball tournament for the Horizon League of the 2017–18 NCAA Division I men's basketball season.
2 seed Wright State, who defeated No.
8 seed Cleveland State in the championship game, and received the conference's automatic berth into the NCAA tournament.
The top six teams received a bye into the quarterfinals.
Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.