ACN may refer to:
Aviation
- ACN, the IATA airport code for Ciudad Acuña International Airport, Coahuila, Mexico
- Aircraft Classification Number, pavement load of an aircraft
Chemistry
- Acetonitrile, CH3CN
- Acrylonitrile, CH2CHCN
Corporate names and media
- Accenture, professional services company, listed on the NYSE as ACN
- ACN Inc., multi-level marketing company providing telecommunications and other services
- Agencia Carabobeña de Noticias, news agency, Valencia, Venezuela
- Agència Catalana de Notícies, news agency, Barcelona, Spain
- American Collectibles Network, former name for Jewelry Television, US
- Atlantis Cable News, fictional news channel on The Newsroom (American TV series)
- Australian Company Number, unique identifier for companies registered in Australia
Sport
- Africa Cup of Nations, biennial football tournament
- Hockey Africa Cup of Nations, biennial field hockey tournament:
- Men's Hockey Africa Cup of Nations
- Women's Hockey Africa Cup of Nations
Other uses
- Achang language, a Tibeto-Burman language of China
- Achnasheen railway station, UK, National Rail code
- Acineta, a genus of orchid
- Action Congress of Nigeria, political party of Nigeria
- Agenzia per la Cybersicurezza Nazionale, Italian government cybersecurity agency, Italy
- Aid to the Church in Need, international Catholic charity based in Königstein im Taunus, Germany
- Algebraic notation (chess), the standard notation for recording chess games (Algebraic chess notation)
- Andean Community of Nations, free trade area
- Anglican Communion Network, network of Anglican and Episcopalian dioceses and parishes
- ante Christum natum, seldom-used Latin equivalent of BC
- Architecture for Control Networks, network protocol for theatrical control