| Acronym | Definition |
|---|
| USSA➣United Socialist States of America (book) |
| USSA➣United States Ski and Snowboard Association |
| USSA➣United States Sports Academy |
| USSA➣United States Student Association |
| USSA➣US Sportsmen's Alliance |
| USSA➣US Sailing Association |
| USSA➣United States Soccer Association |
| USSA➣User Supported Software Association (United Kingdom) |
| USSA➣United States Snooker Association (San Gabriel, CA) |
| USSA➣United States Surfing Association |
| USSA➣United States Surveyors Association |
| USSA➣United States Security Authority for NATO Affairs |
| USSA➣United States of South Africa (Arthur C. Clarke's book 2010) |
| USSA➣United States Softball Association |
| USSA➣United States Space Agency |
| USSA➣Upper Shell Structure Assembly (US NASA) |