NSIB
| 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) |