ACN
- ACN Inc.
- Accenture
- Acetonitrile
- Achang language
- Achnasheen railway station
- Acineta
- Acrylonitrile
- Action Congress of Nigeria
- Africa Cup of Nations
- Agencia Carabobeña de Noticias
- Agenzia per la Cybersicurezza Nazionale
- Agència Catalana de Notícies
- Aid to the Church in Need
- Aircraft Classification Number
- Algebraic notation (chess)
- Andean Community of Nations
- Anglican Communion Network
- Architecture for Control Networks
- Australian Company Number
- Ciudad Acuña International Airport
- Jewelry Television
- Men's Hockey Africa Cup of Nations
- The Newsroom (American TV series)
- Women's Hockey Africa Cup of Nations