| Acronym | Definition |
|---|
| NSIB➣Napa Special Investigations Bureau (Napa, CA) |
| NSIB➣Number State of Interacting Bosons (physics) |
| NSIB➣National Savings Income Bonds (UK) |
| NSIB➣New, Sealed in Box |
| NSIB➣Northern Star International Broadcasters (radio and TV broadcasters union; Norway) |
| NSIB➣North South Implementation Bodies Guidance (Department of Finance and Personnel; Accountability and Accountancy Services Division; UK) |