Eco

Eco may refer to:

• eco-, a prefix mostly relating to ecological or environmental terms
• .eco, (dot-eco), a proposed top-level domain for the Internet
• Eco (currency), a proposed currency
• Eco (video game), a computer simulation game
• Umberto Eco (1932-2016), Italian philosopher, semiotician, novelist
• Eco, a character, played by Jacqueline Duncan, on the children's show The Shak
• The natural substance of energy and power in the Jak and Daxter games
• A character in Dragonar Academy

As an abbreviation

• Enterprise Core Objects, software development framework useful for domain-driven design
• Economic Cooperation Organization, an international organization involving seven Asian and four Eurasian countries
• Electronic Countermeasures Officer, an officer in the reimagined Battlestar Galactica series
• Emil Chronicle Online, a 2005 Japanese MMO computer game
• Encyclopaedia of Chess Openings, a scheme to classify chess openings
• Engineering Change Order, used for changes in documents such as processes and work instructions
• English Chamber Orchestra, a chamber orchestra based in London
• The Environment Children's Organisation, a Canadian child-run organisation for the environment that attended the Earth Summit in 1992. Founded by Severn Cullis-Suzuki.
• The Environmental Commissioner of Ontario
• Environment and Conservation Organisations of Aotearoa New Zealand
• Epichlorohydrin, a synthetic rubber with the ISO code ECO
• Equity carve-out, a sort of corporate restructuring
• Esporte Clube Osasco, a Brazilian football (soccer) club
• Eternally Collapsing Objects, an alternate theory of black hole.
• European Communications Office, the permanent secretariat of the Electronic Communications Committee, a part of European Conference of Postal and Telecommunications Administrations
• ECO (denomination), a Presbyterian denomination (full name ECO: A Covenant Order of Evangelical Presbyterians)
• Noticias ECO, a now defunct 24-hour Spanish-language cable news network, owned and operated by Televisa
• Elementaire Commando Opleiding (elementary commando course) of the Korps Commandotroepen (KCT)