The 2015 Horizon League men's basketball tournament began on March 3, 2015, with the championship game on Tuesday, March 10. First round games were played on the home court of the higher-seeded team. The second round and semifinals were hosted by Valparaiso, because the Crusaders won the regular season conference championship. Since Valparaiso won its semifinal game, it also hosted the championship game. Only eight of the nine teams in the conference played in the Horizon League Tournament, as Milwaukee has been deemed ineligible for postseason play for the 2014–15 season.