USAC is an acronym for Undergraduate Students Association Council, the governing body of the Undergraduate Students Association (USA) whose membership is comprised of every UCLA undergraduate student.

USAC's fifteen student officers and commissioners are elected by members of the Undergraduate Students Association at an annual election held during Spring Quarter. In addition to its fifteen elected members, USAC includes appointed representatives of the Administration, the Alumni, and the Faculty, as well as two ex-officio members, the ASUCLA Executive Director and a student Finance Committee Chairperson who is appointed by the USA President and approved by USAC. All members of USAC may participate fully in Council deliberations, but only the fifteen elected student members have a vote. See the full roster, on the Offices page.

The USA President appoints more than seventy undergraduates to administrative committees and the Academic Affairs Commissioner Appoints approximately 25 undergraduates to Academic Senate Committees. Students have an opportunity to serve on the ASUCLA Board of Directors and the Communications Board, as well as on other significant committees. Through their participation on these campus-wide committees, UCLA undergraduates have had input into the decision making process at a high level.

USA's programs offer an invaluable service to the campus and surrounding communities and provide an opportunity for thousands of students to participate in and benefit from these endeavors. For example, each year approximately 40,000 students, faculty and staff attend programs of the Campus Events Commission, including a low-cost film program, a speakers program which presents leading figures from a wide range of disciplines, and performances by dozens of outstanding entertainers. Two to three thousand UCLA undergraduates participate annually in the more than twenty voluntary outreach programs run by the Community Service Commission. A large corps of undergraduate volunteers also participate in programs run by the Student Welfare Commission, such as AIDS Awareness, Substance Abuse Awareness, Blood Drives and CPR/First Aid Training.