ECSC may stand for: European Coal and Steel Community, a forerunner of the European Union Eastern Colleges Science Conference, an undergraduate research conference in the northeastern United States Eastern Caribbean Supreme Court, a Caribbean court system established under the Organisation of Eastern Caribbean States East Coast Surfing Championships, one of the United States Surfing Federation's major amateur events Expedia CruiseShipCenters European Cybersecurity Challenge, a CTF competition at a European level