| N&B | Natasha and Bolkonskys 
| Others |
| N&B | Neri and Bonacini
| Others |
| n.b. | nota bene (note well)
| Others |
| N/B | Narrow Band
| Others |
| NB | Nacer Bouhani
| Others |
| NB | Naive Bayes
| Others |
| nb | nanobarn
| Others |
| NB | Naples Beach
| Others |
| NB | Napoleon Bonaparte
| Others |
| NB | NarrowBand
| Others |
| NB | Nasal Bone
| Others |
| NB | Nat Binding
| Others |
| NB | Natalie's Bunnies
| Others |
| NB | Nation Books
| Others |
| NB | National Battlefield
| Others |
| NB | National Board
| Others |
| NB | National Body
| Others |
| NB | National Brand
| Others |
| NB | NationsBank
| Others |
| NB | Navigation Base
| Others |
| NB | Navy Basic
| Others |
| NB | Navy Blue
| Others |
| NB | Negative Bias
| Others |
| NB | Negative Big
| Others |
| NB | Negative Binomial
| Others |
| NB | Neil Bogart
| Others |
| NB | Nero Bianco
| Others |
| NB | Net Balance
| Others |
| NB | Net Beans
| Others |
| NB | Net Benefit
| Others |
| NB | Net Benefits
| Others |
| NB | Net Business
| Others |
| NB | NetBall
| Others |
| NB | Neubau
| Others |
| NB | Neuroblastoma
| Others |
| NB | Neutral Battery
| Others |
| NB | Neutral Buoyancy
| Others |
| NB | Never Bail
| Others |
| NB | New Babylon
| Others |
| NB | New Balance
| Others |
| NB | New Basis
| Others |
| NB | New Bedford
| Others |
| NB | New Blood
| Others |
| NB | New Books
| Others |
| NB | New Born
| Others |
| NB | New Breed
| Others |
| NB | New Britain
| Others |
| NB | New Brunswick
| State |
| NB | New Build
| Others |
| NB | New Business
| Others |
| NB | Newbie Beauftragter
| Others |
| NB | Newborn
| Others |
| NB | News Bulletin
| Others |
| NB | Newton Book
| Others |
| NB | Newton Brown
| Others |
| NB | NickelBack / Nickel Back
| Others |
| NB | Nickolas Ball
| Others |
| NB | Nigeria Best
| Others |
| NB | Nigerian Breweries
| Others |
| NB | Nights Booked
| Others |
| NB | Nimbian Brother
| Others |
| NB | Niobium
| Element |
| NB | Nitrogen Base
| Others |
| NB | No B****
| Others |
| NB | No Backup
| Others |
| NB | No Bad
| Others |
| NB | No Ball
| Others |
| NB | No Banner
| Others |
| NB | No Bargaining
| Others |
| NB | No Batteries
| Others |
| NB | No Bible
| Others |
| NB | No Bracing
| Others |
| NB | No Brain
| Others |
| NB | No Break
| Others |
| NB | No Breath
| Others |
| NB | No Broadcast
| Others |
| NB | No Buts
| Others |
| NB | No-Bias
| Others |
| NB | Nocturnal Breeder
| Others |
| NB | Noise Blanker
| Others |
| NB | Nominal Bore
| Others |
| NB | Nominal Budget
| Others |
| NB | Non Bank
| Others |
| NB | Non Bereavement
| Others |
| NB | Non Binary
| Others |
| NB | Non Binding
| Others |
| NB | Non Blank
| Others |
| NB | Non Blocking
| Others |
| NB | Non Bore
| Others |
| NB | Non Bound
| Others |
| NB | Non-Black
| Others |
| NB | Non-Breaking
| Others |
| NB | Non-forest Brush
| Others |
| NB | Noord Brabant
| Others |
| NB | Normal Burst
| Others |
| NB | North Beach
| Others |
| NB | North Belgium
| Others |
| NB | North Berwick
| Others |
| NB | North Bound
| Others |
| NB | North Branch
| Others |
| NB | North Bridge
| Others |
| NB | North Britain
| Others |
| NB | North Broward
| Others |
| NB | Northampton and Bath Railroad (Conrail)
| Others |
| NB | NorthBound
| Others |
| NB | Nose Bleed
| Others |
| NB | Nose Boogers
| Others |
| NB | Not Blue
| Others |
| NB | Nota Bene
| Others |
| NB | Nota Benia
| Others |
| NB | Nota Bien
| Others |
| NB | Note Bene
| Others |
| NB | Notes Bibliography
| Others |
| NB | Nothing Better
| Others |
| NB | Notified Body
| Others |
| NB | Noto Bene
| Others |
| NB | Now Being
| Others |
| NB | Nuclear Bomb
| Others |
| NB | Nuclear Bombing
| Others |
| NB | Nude Bundle
| Others |
| NB | Nudie Burlgler
| Others |
| NB | Number But
| Others |
| NB | Number Of Bands
| Others |
| NB | Nursing Building
| Others |
| NB | Nut Bolt
| Others |
| NB | Nutrient Broth
| Others |
| NB | Sterling Airlines
| Others |
| NB | Text document (Nota Bene)
| Others |
| NB | The Naval Board
| Others |