| Acronym | Definition |
|---|
| NSSB➣Nippon Steel & Sumikin Bussan (various locations) |
| NSSB➣National Skills Standards Board |
| NSSB➣Network Support Services Branch (Internet service provider; Hawaii) |
| NSSB➣National Social Services Board (Department of Finance; Ireland) |
| NSSB➣Nikko Salomon Smith Barney (Japan) |
| NSSB➣North Suburban Symphonic Band |
| NSSB➣North Side State Bank (Rock Springs, WY) |
| NSSB➣Naval Supply Support Battalion (US Navy) |