USAC may refer to:

  • Unified Speech and Audio Coding, an audio compression scheme
  • United States Army Cadet Corps, a non-profit youth education organization
  • United States Auto Club, a sanctioning body for auto racing in the United States
  • Universal Service Administrative Company, a not-for-profit corporation located in Washington, DC
  • Universidad de San Carlos de Guatemala, a University in Guatemala City, Guatemala
  • USA Cycling, or USAC, a governing body for bicycle racing in the United States
  • Utah State Agricultural College, now known as Utah State University, a school in Logan, Utah, USA