| Acronym | Definition |
|---|
| USAC | United States Auto Club |
| USAC | Universidad de San Carlos (University of San Carlos, Guatemala) |
| USAC | Universal Service Administrative Company |
| USAC | Undergraduate Students Association Council (University of California, Los Angeles) |
| USAC | University Studies Abroad Consortium (various schools) |
| USAC | US Airways Center (Phoenix, Arizona) |
| USAC | United States Army Corps |
| USAC | University Sub-Aqua Club (Jamaica) |
| USAC | United States Atlantic Coast |
| USAC | Utrechtsche Studenten Alpenclub (Utrecht, Netherlands) |
| USAC | United States Auto-Sound Challenge |
| USAC | United Seniors of Athens County, Inc. (Ohio) |
| USAC | United States Army Cadet Corps |
| USAC | United States Alpine Club |
| USAC | United States of America Cycling (Colorado Springs, CO) |