NB
- Boeing NB
- Bokmål
- Mandarin Chinese profanity
- Mazda MX-5 (NB)
- N.B. (album)
- NB (TV programme)
- NB (programming language)
- NB Global Monthly Income Fund
- NB class
- Naive Bayes classifier
- Nanobarn
- Narrowboat
- National Battlefield
- National bank (disambiguation)
- Nebraska
- Neuroblastoma
- New Balance
- New Brunswick
- Niesenbahn
- Nigerian Breweries
- Niobium
- No-ball
- Nominal bore
- Non-binary
- North Britain
- Nota bene
- Oscar Wilde
- Sterling Airlines
- The Importance of being Earnest