| Acronym | Definition |
|---|
| BBN | Big Blue Nation (University of Kentucky Wildcats) |
| BBN | Bible Broadcasting Network (Christian radio network) |
| BBN | Bolt, Beranek, & Newman |
| BBN | Big Bang Nucleosynthesis (cosmology) |
| BBN | Bye Bye Now |
| BBN | Broadband Network |
| BBN | Business Building Network |
| BBN | Business Brokers Network |
| BBN | Bayesian Belief Network |
| BBN | Backbone Network |
| BBN | Barbarian (Dungeons and Dragons class) |
| BBN | Baltic Business News |
| BBN | Bruin Broadcast Network (Catholic High School) |
| BBN | Big Brother News |
| BBN | Broadband Noise |
| BBN | Building Better Neighborhoods (various locations) |
| BBN | Bayanihan Blog Network (Philippines) |
| BBN | Bellingham Business News (Bellingham, WA) |
| BBN | Bureau Burundais de Normalisation et Contrôle de la Qualité (French: Burundi Bureau of Standards and Quality Control; Burundi) |
| BBN | Biuro Bezpieczenstwa Narodowego (Poland) |
| BBN | Base-Band Node |
| BBN | Bulk Billing Number |
| BBN | Burly Bear Network (TV) |
| BBN | BasketBallNation |
| BBN | BeauBlancNoir (French: Beautiful White Black; sports club) |
| BBN | Brass Band Normandie (France) |
| BBN | Brethren Business Network (Organization of Church of the Brethren / Christian values in the workplace) |
| BBN | Brèves Basse-Normandie (French: Short Lower Normandy) |
| BBN | Blanc Beur Noir (French charitable organization) |