ECA, Eca or Eça may refer to:

• ECA International, a consulting firm
• ECA Records, a record label based in New York City
• Encana, a Canadian independent petroleum company that existed from 2002 to 2020
• Eurocypria Airlines, a Cypriot charter airline that operated from 1992 to 2010
• European Coastal Airlines, a Croatian seaplane operator that existed from 2000 to 2016

• 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

• Bureau of Educational and Cultural Affairs, of the United States Department of State
• Economic Commission for Africa, a United Nations commission for encouraging economic cooperation among nations of the African continent)
• Economic Cooperation Administration, a former United States government agency
• Electronic Components Assemblies, a division of the Electronic Industries Alliance
• European Court of Auditors, an institution of the European Union
• Executive Council of Alberta, the Canadian province's executive branch
• Export credit agency, a private or quasi-governmental institution that acts as an intermediary between national governments and exporters
• United Nations Economic Commission for Africa, a commission to encourage economic cooperation among African countries

• Electoral Count Act, of the United States
• Essential Commodities Act, of the Parliament of India
• European Chips Act, a legislative package to encourage semiconductor production in the European Union
• European Communities Act 1972 (Ireland), of the Oireachtas (Irish Parliament)
• European Communities Act 1972 (UK), of the Parliament of the United Kingdom

• ECA stack, a combination of ephedrine, caffeine, and aspirin
• Emergency care assistant, in the United Kingdom
• External carotid artery
• External control arm clinical trial

• António Eça de Queiroz (1891 - 1968), a Portuguese monarchist politician and agitator
• António Júlio da Costa Pereira de Eça (1852 - 1917), a general of the Portuguese Army, a colonial administrator and minister of War
• Duarte de Eça (born c. 1480), 3rd Captain-major of Portuguese Ceylon
• Eça de Queiroz (1845 - 1900), one of the greatest Portuguese writers in the realist style
• Ferdinand of Portugal, Lord of Eça (c. 1378 - c. 1460), the son of Portuguese Infant John, Duke of Valencia de Campos
• Filipa de Eça (c. 1480 - 1551), a 16th-century Portuguese nun
• Joana de Eça (1480 - 1572), a Portuguese courtier and royal favorite
• Luiz Eça (1936 - 1992), Brazilian pianist

• Elementary cellular automaton
• Engineering Critical Assessment
• Enterobacterial common antigen
• Enterprise Collaboration Architecture, a standard of the Object Management Group
• Ethyl cyanoacrylate
• European Crystallographic Association, an independent scientific organisation, representing both national crystallographic associations in Europe as well as individual members
• Event condition action, a principle to define triggers in a database

• Euroleague Commercial Assets, a private company that runs and operates the top continental-wide basketball men's professional sports club competitions in Europe
• European Canoe Association, the umbrella organization for canoeing sport in Europe
• European Club Association, an association of European football clubs

• Easington Catchment Area, a group of natural gas fields in the North Sea
• Ecologically Critical Area, in Bangladesh
• Electrical Contractors' Association, a British industry association
• Emission Control Area, sea areas with regulated sulfur and nitrous oxides emission caps
• 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
• European Compliance Academy, a leading European not-for-profit organization for promoting harmonization of GMP and regulatory guidelines within the EU pharmaceutical industry
• European Communist Action, a coalition of political parties
• Evangelical Church Alliance

This disambiguation page lists articles associated with the title ECA.
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