ECB may refer to:
Businesses and organizations Banking and finance European Central Bank, an institution of the European Union Equatorial Commercial Bank, later Spire Bank, in Kenya
Sport England and Wales Cricket Board, the national governing body of cricket Emirates Cricket Board, the governing body of certain cricket activities in United Arab Emirates East Coast Bays AFC, a New Zealand football club
Education Environmental Campus Birkenfeld, of Trier University of Applied Sciences in Germany Wisconsin Educational Communications Board, in the US Government Engineering College Bikaner, in Rajasthan, India
Other organizations ECB Project (Emergency Capacity Building Project), an NGO partnership to improve humanitarian response Environmental Control Board, of the New York City Office of Administrative Trials and Hearings European Chemicals Bureau, a former organisation of the European Union
Technology Electronic codebook, a block cipher encryption mode Electronically controlled brake, a Toyota brake-by-wire system Ethylene copolymer bitumen, for waterproofing Entity–control–boundary, an architectural pattern in object-oriented programming Europe Card Bus, a 1977 computer bus
Other uses East Coast Bays, Auckland, New Zealand External commercial borrowing, a type of loans in India Class ECB trains, a class of Reading electric multiple units