C.I.F. Southern Section (commonly abbreviated as CIFSS) is the largest of the ten sections which comprise the California Interscholastic Federation. Its membership includes most public and private high schools in Orange, Los Angeles, Riverside, San Bernardino, Ventura, Santa Barbara, San Luis Obispo, Mono, and Inyo counties, as well as a small portion of Kern County. However, teams from the Los Angeles Unified School District compete in a separate section, and Needles High School, at the far eastern edge of San Bernardino County, is a member of the Nevada Interscholastic Athletics Association.

CIFSS's offices are located in Los Alamitos.

Sports

CIFSS sponsors the following sports:

Fall Season

• 11-man Football (divided into 13 divisions)
• Eight-man football (2 divisions)
• Cross country
• Field Hockey
• Girls' Volleyball (10 divisions)
• Girls' Tennis (5 divisions)
• Boys' Water Polo (6 divisions)

Sponsors

CIFSS's major sponsors include Toyota, 24 Hour Fitness, and Verizon Wireless.