| Acronym | Definition |
|---|
| ACN | ACN, Inc. (not an acronym; formerly American Communications Network; Concord, NC) |
| ACN | Australian Company Number |
| ACN | Accenture (stock symbol) |
| ACN | Accenture |
| ACN | Advanced Computer Networks (course) |
| ACN | Acetonitrile |
| ACN | African Cup of Nations (sporting event) |
| ACN | Automatic Collision Notification (US DOT) |
| ACN | Australian College of Nursing |
| ACN | Aid to the Church in Need (Catholic charity) |
| ACN | American Communications Network (various locations) |
| ACN | Automatic Crash Notification |
| ACN | Automatic Client Netware |
| ACN | Anglican Communion Network |
| ACN | Automatic Crash Notification (GM OnStar) |
| ACN | Athletic Club Northeast (fitness club; Atlanta, GA) |
| ACN | Arabian Computer News (magazine) |
| ACN | Ascension Island (STDN Station) |
| ACN | Anglican Church in Nigeria |
| ACN | Association for Comprehensive NeuroTherapy |
| ACN | Aircraft Classification Number |
| ACN | Academic Computer Network (various locations) |
| ACN | Adventist Communication Network |
| ACN | Association of Camp Nurses |
| ACN | Air Cargo Netherlands |
| ACN | Animal Compassion Network (North Carolina) |
| ACN | All Communication Network (various locations) |
| ACN | Area Code Number |
| ACN | Australian Cancer Network |
| ACN | American Comedy Network |
| ACN | Advanced Control Network (entertainment lighting) |
| ACN | Anti-Corruption Network for Transition Economies (Organisation for Economic Co-operation and Development) |
| ACN | Airborne Communications Node |
| ACN | Agence Chine Nouvelle (French: New China News Agency; China) |
| ACN | Andean Community of Nations |
| ACN | Aquatic Conservation Network |
| ACN | Alumni Career Network (various schools) |
| ACN | Architecture Centre Network (UK) |
| ACN | American Community Newspapers, Inc. (Addison, TX; also seen as ACNI) |
| ACN | Ante Christum Natum (Latin: Before the Birth of Christ) |
| ACN | Australian Customs Notice (Australian Customs and Border Protection Service) |
| ACN | Apple Consultant Network |
| ACN | Alliance Carton Nature (French food packaging recycling association) |
| ACN | Advance Change Notice |
| ACN | Association of Consultants to Nonprofits |
| ACN | Architectuurcentrum Nijmegen (Dutch: Nijmegen Architecture Centre; Netherlands) |
| ACN | A. C. Nielsen Company (marketing research) |
| ACN | Associate College Network (UK) |
| ACN | Audit Control Number (banking) |
| ACN | Asamblea Canaria Nacionalista (Canary Nationalist Party) |
| ACN | Association de Comptabilité Nationale (French: National Accounting Association; est. 1983) |
| ACN | ASEAN (Association of Southeast Asian Nations) Creative Network (Japan) |
| ACN | America's Collectables Network |
| ACN | Acoustic Neurinoma |
| ACN | Associate Charge Nurse (Victoria, Australia) |
| ACN | Administrative Change Notice |
| ACN | Assign Commercial Network |
| ACN | Adaptive C4ISR Node |
| ACN | Automatic Celestial Navigation |
| ACN | America Coasters Network (roller coasters) |
| ACN | Account Control Number |
| ACN | Agreement Change Notice |
| ACN | Alternate Contact Name |
| ACN | Association des Cinéphiles de Nabeul (French: Nabeul Association of Moviegoers; Tunisia) |
| ACN | Area Control Network (computer science) |
| ACN | Australia Campus Network |
| ACN | l'Association Canadienne de Numismatique (Canadian Numismatic Association) |
| ACN | Audiotext Communications Network, Inc. |
| ACN | Automobile Club de Nice (French: Automobile Club of Nice; Nice, France) |
| ACN | All Commercial Network |
| ACN | Authorization Change Notice |
| ACN | Action Control Number |
| ACN | Activity/Authorized Control Number |
| ACN | Automatic Change Notification |
| ACN | Abbreviated Contract Number |
| ACN | ATM Core Network |
| ACN | Aircraft Condition Notice (FAA Form 8620-1) |
| ACN | Assignment Control Number |
| ACN | Airborne Communications Network |
| ACN | Assigned Channel Number |
| ACN | Athlétic Club Neufchâteau (French athletic club) |
| ACN | Allowance Change Notice |
| ACN | Américan Car Namurois (French; Belgian car club) |