ECL
- ECL (data-centric programming language)
- ECL programming language
- East Cornwall League
- Eastern Colored League
- Eastern Counties Football League
- Eccleston Park railway station
- Ecolab
- Educational Community License
- Electrochemiluminescence
- Embeddable Common Lisp
- Emitter-coupled logic
- Enhanced chemiluminescence
- Enterochromaffin-like cell
- European Champions League (table tennis)
- European Cricket League
- Exit Control List
- Extended collective licensing
- Government of Pakistan
- UEFA Europa Conference League
- École centrale de Lyon