| Abbreviation | Definition |
|---|---|
| NBC | Nearly Blues Content |
| NBET | National Black Ensemble Theatre |
| NBGN | Narrow Band Gaussian Noise |
| NBHF | narrow band high frequency |
| NBI | Narrow Band Imaging |
| NBIR | Narrow Band Interference Rejection |
| NBK | Nasty Boy Klick |
| NBNB | Na Band Na Baraati |
| NBNB | NI Blues NI Band |
| NBO | Narrow Band Optics |
| NBO | No Borders Orchestra |
| NBST | Narrow Band Subscriber Terminal |
| NBT | Narrow Bandwidth Technology |
| NBT | Next Big Thing |
| NBYO | New Brunswick Youth Orchestra |
| NC | No Chord |
| NCBB | North Carolina Brass Band |
| NCBC | National Campus Band Competition |
| NCBS | Northern California Bluegrass Society |
| NCCB | Nature Coast Community Band |