NBN or nbn may refer to:

• National Black Network, US radio network
• National Broadcasting Network (Lebanon)
• National Broadcasting Network (Trinidad and Tobago)
• Nagoya Broadcasting Network, Japan
• Nanjing Broadcasting Network, China
• NBN Television, New South Wales, Australia
• Newsounds Broadcasting Network a Filipino radio network, managed by Bombo Radyo Philippines
• People's Television Network, Philippines, formerly National Broadcasting Network

• Bureau of Normalization, Belgium
• National Biodiversity Network, UK
• NBN Co, aka nbn, Australian Government corporation responsible for National Broadband Network
• Nefesh B'Nefesh, Israeli organization encouraging immigration

• North by Northwestern, magazine of Northwestern University, US

• Annobón Airport, Equatorial Guinea (IATA code)
• National Bingo Night (disambiguation), a game show in several countries
• National Bibliography Number, several publication identifier systems
• National Broadband Network, Australian national wholesale open-access data network
• New Brighton railway station, England, National Rail station code
• Nibrin, a protein
• Niobium nitride (NbN)
• North Brighton railway station, Melbourne

• All pages with titles containing NBN