| Acronym | Definition |
|---|
| NSSU➣Nonstop Software Upgrade |
| NSSU➣Nippon Sport Science University (Japan) |
| NSSU➣National Sunday School Union (now known as the National Christian Education Council) |
| NSSU➣National Security Service of Ukraine (est. 1991) |
| NSSU➣North Sydney Station Upgrade (railway station; Sydney, Australia) |