The Cal State Northridge Matadors are the athletic teams that represent California State University, Northridge in Northridge, Los Angeles, California. The Matadors field 17 teams in nineteen sports. The Matadors compete in NCAA Division I and are members of the Big West Conference. CSUN has been a member of the Big West Conference since the summer of 2001 for most sports. The men's and women's indoor track and field teams compete in the Mountain Pacific Sports Federation instead. Men's volleyball also competed in the Mountain Pacific Sports Federation, but began to compete in the Big West beginning in 2018.

The Big Sky Conference is a collegiate athletic conference affiliated with the NCAA's Division I with football competing in the Football Championship Subdivision. As of 2023, full member institutions are located in the states of Arizona, California, Colorado, Idaho, Montana, Oregon, Utah, and Washington. Two affiliate members from California are football–only participants.