The 2018–19 Cal State Northridge Matadors men's basketball team represented California State University, Northridge in the 2018–19 NCAA Division I men's basketball season. The Matadors, led by first-year head coach Mark Gottfried, competed at the Matadome. CSU Northridge was a member of the Big West Conference, and participated in their 18th consecutive season in that league. They finished the season 13–21, 7–9 in Big West play to finish in a tie for sixth place. They lost in the quarterfinals of the Big West tournament to UC Santa Barbara. They were invited to the College Basketball Invitational where they lost in the first round to Utah Valley.
