| Abbreviation | Definition |
|---|---|
| USSI | United Service Source Inc |
| USSI | United Staffing Solutions Inc |
| USSI | United Steel Storage Inc |
| USSI | United Steel Structures Incorporated |
| USSI | United Systems and Software Inc |
| USSI | Universal Software Solutions Inc |
| USSI | Utility Sales and Service Inc |
| USSL | Universities Superannuation Scheme Ltd |
| USSVI | United States Submarine Veterans, Inc |
| UST | United States Testing, Inc. |
| USTC | United Shipping & Trading Company |
| USTG | U. S. Tool Grinding, Inc. |
| USTI | United Sciences Testing Inc |
| USTI | United Systems Technology Inc |
| USTM | USTech Materials Corporation |
| USTS | U S Technology Solutions |
| USV | Ultimate Sound & Visual Productions Company |
| USV | Universal Specialty Vehicles |
| USW | U.S. Wheat |
| USW | United Software Writers, LTD. |