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
- Ercan International Airport (IATA airport code), Cyprus
- 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
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