The 2018–19 Montana State Bobcats men's basketball team represented Montana State University during the 2018–19 NCAA Division I men's basketball season. The Bobcats, led by fifth-year head coach Brian Fish, played their home games at Brick Breeden Fieldhouse in Bozeman, Montana as members of the Big Sky Conference. They finished the season 15–17, 11–9 in Big Sky play to finish in a three-way tie for fourth place. They defeated Idaho in the first round of the Big Sky tournament before losing in the quarterfinals to Eastern Washington.