The 2017–18 Southern Utah Thunderbirds basketball team represented Southern Utah University during the 2017–18 NCAA Division I men's basketball season. The Thunderbirds were led by second-year head coach Todd Simon and played their home games at the America First Events Center in Cedar City, Utah as members of the Big Sky Conference. They finished the season 13–19, 5–13 in Big Sky play to finish in tenth place. In the Big Sky tournament they defeated Idaho State and Idaho to advance to the semifinals where they lost to Eastern Washington.