ECN may refer to:
Organizations and companies ECN (TV station), former name of NEN, in New South Wales, Australia ECN Capital, a Canadian financing company Electoral Commission of Namibia Energy Research Centre of the Netherlands (Dutch: ) Environmental Change Network, of the British Natural Environment Research Council Ercan International Airport, in Northern Cyprus European Competition Network European Crowdfunding Network
Science and technology Electrochemical noise, fluctuations of current and potential
Computing Electronic communication network, for trading of financial products Explicit Congestion Notification, in network congestion Encoding Control Notation, a formal language that is part of the Abstract Syntax Notation One Ethernet Consist Network, protocol used in train communications
Other uses Engineering change notice, used to implement changes to components or products Enhanced capital note, a fixed-income instrument Eastman Color Negative, a photographic processing system