NB
- nb – (s) Norwegian Bokmål language (ISO 639-1 code)
- Nb – (s) Niobium
- NB – (s) New Brunswick (postal symbol) – (i) nota bene (Latin, "mark well")
- NBA – (i) National Basketball Association
- NBACC – (i) U.S. National Biodefense Analysis and Countermeasures Center ("enn-back")
- NBC – (i) National Broadcasting Corporation – Nuclear, Biological, and Chemical
- NBCRS – (i) NBC (Nuclear, Biological, and Chemical) Reconnaissance System
- nbl – (s) Southern Ndebele language (ISO 639-2 code)
- NBL – (a) National Basketball League (Australia)
- NBT – (p) Nitroblue tetrazolium (assay)
Read more about this topic: List Of Acronyms And Initialisms: N