| Acronym | Definition |
|---|
| USSI➣Unione Stampa Sportiva Italiana (Italian: Italian Sports Press Union) |
| USSI➣UnderSea Sensor Systems, Inc (Ultra Electronics; Columbia City, IN) |
| USSI➣United Service Source, Inc. (Florida) |
| USSI➣Universal Synchronous Serial Interface (Adtran Inc.) |
| USSI➣United States Snowboard Instructors (Scarborough, ME) |
| USSI➣Universal Software Solutions, Inc. (Davison, MI) |
| USSI➣Utility Sealing Services, Inc. |