The 2017–18 Cal State Northridge Matadors men's basketball team represented California State University, Northridge (also known as CSUN) during the 2017–18 NCAA Division I men's basketball season. The Matadors, led by fifth-year head coach Reggie Theus, played their home games at the Matadome as members of the Big West Conference. They finished the season 6–24, 3–13 in Big West play to finish in last place. They failed to qualify for the Big West tournament.