ECA may refer to:
Companies
- ECA International, a consulting firm
- ECA Records
- Encana
- Eurocypria Airlines
- European Coastal Airlines
Education
- ACES Educational Center for the Arts, in New Haven, Connecticut, United States
- Edinburgh College of Art, in Scotland
- Education Corporation of America, a company running schools in southern American states
- Emmanuel Christian Academy (Ohio), in Springfield, Ohio
- Escuela Campo Alegre, an American international school in Caracas, Venezuela
- Evangel Christian Academy, in Shreveport, Louisiana
- Evangelical Christian Academy (Madrid, Spain)
- School of Communications and Arts, University of São Paulo (Portuguese: Escola de Comunicações e Artes), in Brazil
Government
- Bureau of Educational and Cultural Affairs, of the United States Department of State
- Economic Cooperation Administration, a former United States government agency
- European Court of Auditors, an institution of the European Union
- Executive Council of Alberta, the Canadian province's executive branch
- Export credit agency
- United Nations Economic Commission for Africa, a commission to encourage economic cooperation among African countries
Law
- Electoral Count Act, of the United States
- Essential Commodities Act, of the Parliament of India
- European Communities Act 1972 (Ireland), of the Oireachtas (Irish Parliament)
- European Communities Act 1972 (UK), of the Parliament of the United Kingdom
Medicine and anatomy
- ECA stack, a combination of ephedrine, caffeine, and aspirin
- Emergency care assistant, in the United Kingdom
- External carotid artery
- External control arm clinical trial
Science and technology
- Elementary cellular automaton
- Engineering Critical Assessment
- Enterobacterial common antigen
- Enterprise Collaboration Architecture, a standard of the Object Management Group
- Ethyl cyanoacrylate
- Event condition action, a principle to define triggers in a database
Sports
- European Canoe Association
- European Club Association, an association of European football clubs
Other uses
- Easington Catchment Area, a group of natural gas fields in the North Sea
- Ecologically Critical Area, in Bangladesh
- Emission Control Area, sea areas with regulated sulfur and nitrous oxides emission caps
- Electrical Contractors' Association, a British industry association
- Entertainment Consumers Association, an American consumer advocacy organization
- Europe and Central Asia, an abbreviation used by the World Bank
- European Cockpit Association, a trade union
- Evangelical Church Alliance
- Luiz Eça (1936–1992), Brazilian pianist
- European Communist Action, a coalition of political parties
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