ECN

ECN may refer to:

• Eastern Counties Newspapers, a company now known as Archant
• Eastman Color Negative, a photographic processing system for motion-picture films
• Electrochemical noise, fluctuations of current and potential
• Electronic communication network, a type of computerized financial trading system
• Encoding Control Notation, a standard notation that allows the specification of custom encoding rules for ASN.1 types
• Energy Research Centre of the Netherlands (Energieonderzoek Centrum Nederland)
• Engineering Change Notice, a form that records the details of an engineering change
• Environmental Change Network, a UK system for monitoring long-term environmental change
• Ercan International Airport (IATA airport code), Cyprus
• European Community number, an identifier for chemical substances for regulatory purposes in the European Union
• European Competition Network, a network of competition authorities in the European Union
• European Counter Network, a political provider
• Explicit Congestion Notification, an extension to the Internet Protocol for network congestion avoidance
• Former callsign of NEN (TV station) in Taree, New South Wales, Australia