ECCC may refer to:
- East Central Community College, a junior college in Decatur, Mississippi, USA
- Eastern Collegiate Cycling Conference, a college-level bicycle-racing association in the eastern USA
- Electronic Colloquium on Computational Complexity, an electronic archive of computer science papers
- Electronic Commerce Council of Canada, the former name of GS1 Canada, a trade association
- Emerald City ComiCon, an annual comic book and pop culture convention held annually in Seattle, Washington, USA.
- Essex County Cricket Club, a club for the sport of cricket in Essex, England
- Eucharistic Catholic Church in Canada, an independent Catholic denomination
- European Club Cup of Champions, a table tennis competition
- European Communities Chemistry Council, an association of chemistry societies
- European Computer Competence Certificate, a computer competence testing system
- European Creep Collaborative Committee, an organization for investigating the strengths of welded materials
- Evangelical Christian Church in Canada, the Canadian branch of Evangelical Christianity
- Extraordinary Chambers in the Courts of Cambodia, better known as the Khmer Rouge Tribunal
- Taiwan–Hong Kong Economic and Cultural Co-operation Council