NNB
| Acronym | Definition |
|---|---|
| NNB | New Northwest Broadcasters (est. 1998; Seattle, WA) |
| NNB | New Nuclear Build Generation Company (UK) |
| NNB | Northern Native Broadcasting (Canada) |
| NNB | Number Nine Bus |
| NNB | Negative Nitrogen Balance |
| NNB | National Neopian Bank (Neopets) |
| NNB | Numbers Needed to Benefit (vascular medicine) |
| NNB | Non-Night-Blind Controls (nutrition) |