ABN or abn is a three-letter acronym that may refer to:
- IATA airport code for Albina Airport in Albina, Suriname
- ABN AMRO, sometimes referred to as "ABN" in shorthand
- ABN AMRO Group
- ABN Andhra Jyothi, a Telugu language news channel based in India
- ABN Radio, the Agri Broadcast Network, an Ohio-based agricultural radio news network
- ABN (TV station), the Australian Broadcasting Corporation's Sydney TV station
- Agencia Bolivariana de Noticias, the national news agency of Venezuela
- Alaska Board of Nursing, the regional board of nurses in the state of Alaska, USA
- Alcock Brown-Neaves Group, Australian property development company
- Algemeen Beschaafd Nederlands (Common Civilized Dutch), the near-obsolete name for now "Common Dutch"
- Algemene Bank Nederland, a now-defunct Dutch bank
- Asahi Broadcasting Nagano, a TV station in Nagano Prefecture, Japan
- Asia Business News a now-defunct business news channel
- Assholes by Nature, an album & rap duo by rappers Trae & Z-Ro
- Assumed Business Name, in Oregon corporation law (aka "doing business as" elsewhere in the US)
- Australian Business Number, a unique identifier issued to business entities by the Australian Taxation Office
- Niger Basin Authority (Authorité du Bassin du Niger), an intergovernmental organisation in West Africa
- Avivamiento Broadcasting Network, a religious local TV station in Bogotá, Colombia