| ECN | E-Commerce Nation 
| Others |
| ECN | E-Commerce News
| Others |
| ECN | Early Career Network
| Others |
| ECN | East Coast News
| Others |
| ECN | Eastman Color Negative
| Others |
| ECN | Eastside Community Network
| Others |
| ECN | Ecole Centrale De Nantes
| Others |
| ECN | Edge Computing and Networking
| Others |
| ECN | Educational Computer Network
| Others |
| ECN | Elbows Couplings Nipples
| Others |
| ECN | Electoral Commission of Namibia
| Others |
| ECN | Electric City Network
| Others |
| ECN | Electronic Change Notice
| Others |
| ECN | Electronic Change Notification
| Others |
| ECN | Electronic Communication Network
| Others |
| ECN | Electronic Communication Networks
| Others |
| ECN | Electronic Communications Network
| Others |
| ECN | Electronic Communications Networks
| Others |
| ECN | Electronic Component News
| Others |
| ECN | Electronic Contract Note
| Others |
| ECN | Electronic Course Network
| Others |
| ECN | Electronic Crossing Network
| Others |
| ECN | Electronics Communication Network
| Others |
| ECN | EMC Community Network
| Others |
| ECN | Emergency Care Network
| Others |
| ECN | Emergency Communication Networks
| Others |
| ECN | Emergency Communications Network
| Others |
| ECN | Encoding Control Notation
| Others |
| ECN | Engine Combustion Network
| Others |
| ECN | Engineering as Collaborative Negotiation
| Others |
| ECN | Engineering Change Notice
| Others |
| ECN | Engineering Component News
| Others |
| ECN | Engineering Computer Network
| Others |
| ECN | Engineering Consultants Norway
| Others |
| ECN | Entertainment Computing Network
| Others |
| ECN | Entomological Collections Network
| Others |
| ECN | Environmental Change Network
| Others |
| ECN | Epoxy Cresol Novolac
| Others |
| ECN | Ercan, Cyprus
| Others |
| ECN | ETAC Collaboration Network
| Others |
| ECN | European Competition Network
| Others |
| ECN | European Complement Network
| Others |
| ECN | European Compost Network
| Others |
| ECN | European Cricket Network
| Others |
| ECN | European Crowdfunding Network
| Others |
| ECN | Exam Coordinators Network
| Others |
| ECN | Excess Charge Notice
| Others |
| ECN | Executive Channel Network
| Others |
| ECN | Experimental and Clinical Neurosciences
| Others |
| ECN | Explicit Congestion Notification
| Others |
| ECN | External Carotid Nerve
| Others |
| ECN | External Communication Network
| Others |
| ECN | External Cuneate Nucleus
| Others |
| ECN | Eye Cancer Network
| Others |
| ECN | Mid Michigan Community College, Harrison, Michigan Library code
| Others |