ACN may stand for:

• Ante Christum Natum, the Latin equivalent of BC, seldom used in English.
• Accenture Ltd, stock symbol
• ACN, BSR E1.17, Entertainment Technology - Multipurpose Network Control Protocol Suite: This protocol suite, which is also known as the Advanced Control Network (ACN), is designed to provide interoperability between diverse equipment operating on networks that support UDP/IP and related protocols. http://www.engarts.eclipse.co.uk/acn/
• Armored Core: Nexus, a game published by From Software for the PlayStation 2

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