ECF
- Conference finals (disambiguation)
- East Coast fever
- Economic Cooperation Foundation
- Eighteenth-Century Fiction
- Electrochemical fluorination
- Electronic court filing
- Elemental chlorine free
- English Chess Federation
- Enterocutaneous fistula
- Enterprise Capital Fund
- European Climate Forum
- European Climate Foundation
- European Cultural Foundation
- European Curling Federation
- European Cyclists' Federation
- Evangelize China Fellowship
- Evolving classification function
- Extracellular fluid
- Eye-controlled focusing
- National Basketball Association
- National Hockey League