ACN

ACN may refer to:
 * Accenture, professional services company, listed on the NYSE as ACN
 * Achang language, a Tibeto-Burman language of China
 * Achnasheen railway station, UK, National Rail code
 * Acineta, a genus of orchid
 * ACN Inc., multi-level marketing company providing telecommunications and other services
 * Action Congress of Nigeria, political party of Nigeria
 * 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
 * Agencia Carabobeña de Noticias, news agency, Valencia, Venezuela
 * Agència Catalana de Notícies, news agency, Barcelona, Spain
 * Agenzia per la Cybersicurezza Nazionale, Italian cybersecurity agency, Rome, Italy
 * Aid to the Church in Need, Catholic charity in Königstein im Taunus, Germany
 * Aircraft Classification Number, pavement load of an aircraft
 * Algebraic chess notation, the standard notation for recording chess games
 * American Collectibles Network, former name for Jewelry Television, US
 * 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
 * Atlantis Cable News, fictional news channel on The Newsroom (American TV series)
 * Australian Company Number, unique identifier for companies registered in Australia
 * Ciudad Acuña International Airport, an airport in Ciudad Acuña, Mexico

Chemistry

 * Acetonitrile, CH3CN
 * Acrylonitrile, CH2CHCN