| Acronym | Definition |
|---|
| NB | Nota Bene (Latin: Note Well) |
| NB | New Balance Athletic Shoe, Inc. |
| NB | New Brunswick |
| NB | Mathematica Notebook (file extension) |
| NB | National Bank |
| NB | Notebook |
| NB | New Business (various locations) |
| NB | News Busters |
| NB | Newborn |
| NB | Next Best |
| NB | New Braunfels (New Braunfels, Texas) |
| NB | Notice Board |
| NB | Niobium |
| NB | Non-Binary |
| NB | Not Bad |
| NB | Naval Base |
| NB | North Bend (Washington) |
| NB | North Bridge |
| NB | Narrow Band |
| NB | Notified Body (European Commission) |
| NB | North Bergen (New Jersey) |
| NB | Neon Bible (Arcade Fire album) |
| NB | New Building (various organizations) |
| NB | Noord Brabant (Netherlands province) |
| NB | Nutrient Broth (microbiology) |
| NB | No Brainer |
| NB | Naughty Boy |
| NB | North Brookfield |
| NB | Nippon Bearing Co., Ltd. (Japan) |
| NB | Neuberger Berman (asset management firm; est. 1939; various locations) |
| NB | Night Below (fantasy novel) |
| NB | Narrow Body (aircraft) |
| NB | Non-Black |
| NB | Now Boarding |
| NB | National Bookstore (Philippines) |
| NB | No Bother |
| NB | Navigation Base |
| NB | Non-Binding (chemistry) |
| NB | Newsboys (band) |
| NB | Nitrogen Base |
| NB | Norges Bank (Norway) |
| NB | No Base |
| NB | Nieuw Buinen (town in The Netherlands) |
| NB | North-Bound |
| NB | No-Bid |
| NB | No Ball |
| NB | Nude Beaches |
| NB | Neighborhood Business |
| NB | Neutral Buoyancy |
| NB | Nitrogen Balance |
| NB | Newbreed (TFC Clan) |
| NB | Notchback (automobile body style) |
| NB | Nominal Bore (internal diameter of a pipe/fitting) |
| NB | Nice Boys (Guns N' Roses song) |
| NB | Nightbreed (The Clan) |
| NB | No Brown (fish) |
| NB | Non Billable |
| NB | Sterling European Airlines (airline code) |
| NB | New Bombay |
| NB | Nordlandsbanken |
| NB | North Bonneville (Washington) |
| NB | Ninja Burger (humor website) |
| NB | Negative Burn (Quake 3 Clan) |
| NB | Nonbattle |
| NB | Nonabyte (1e+27 bytes) |
| NB | New Babylonian |
| NB | Noisy Bus |
| NB | Nassif Building (Falls Church, Virginia) |
| NB | Nuclear Boiler |
| NB | Nordicbots (QuakeNet gaming) |
| NB | Occupation Semipostal (Scott Catalogue prefix; philately) |
| NB | Noob Busters (gaming clan) |
| NB | Non-Bound Application (insurance) |