| Abbreviation | Definition |
|---|---|
| USEF | United States Equestrian Federation |
| USET | United States Equestrian Team |
| USFA | United States Fastpitch Association |
| USFA | United States Football Alliance |
| USFA | United States Futsal Association |
| USFB | Upper School Football |
| USFC | United Sikkim Football Club |
| USFF | United States Futsal Federation |
| USFH | United States Field Hockey |
| USFL | United States Football League |
| USFM | United Soccer Federation of Maine |
| USFO | United Sports Fans Organization |
| USFSA | United States Figure Skating Association |
| USFT | United States Fall Tour |
| USGA | United States Golf Association |
| USGC | United States Golf College |
| USGDC | United States Games, Day Coverage |
| USGF | United States Gymnastic Federation |
| USGI | United States Golf Institute |
| USGP | United States Grand Prix |