ECN
- ECN (TV station)
- ECN Capital
- Eastman Color Negative
- Electoral Commission of Namibia
- Electrochemical noise
- Electronic communication network
- Encoding Control Notation
- Energy Research Centre of the Netherlands
- Engineering change notice
- Enhanced capital note
- Environmental Change Network
- Ercan International Airport
- Ethernet Consist Network
- European Competition Network
- European Crowdfunding Network
- Explicit Congestion Notification