ECB
ECB may refer to:

Organizations
 European Central Bank, the central bank for the Eurozone of the European Union 
 European Chemicals Bureau, the Toxicology and Chemical Substances Unit of the Joint Research Centre of the European Commission
 ECB Project (Emergency Capacity Building Project), a humanitarian capacity building project
 England and Wales Cricket Board, the governing body of cricket in England and Wales
 Emirates Cricket Board, the official governing body of cricket in the United Arab Emirates
 East Coast Bays AFC, a football team from East Coast Bays, New Zealand
 Environmental Control Board, New York City, US
 Equatorial Commercial Bank, former name of the Spire Bank, Kenya

Education
 Environmental Campus Birkenfeld, a branch of the Trier University of Applied Sciences in Rhineland-Palatinate, Germany
 Wisconsin Educational Communications Board, a Wisconsin state agency, US
 Government Engineering College Bikaner, a technical education institute in Bikaner, Rajasthan, India

Technology
 Electronic codebook, a type of data encryption using block ciphers
 Electronically controlled brake, Toyota's brake-by-wire system
 Electronically controlled pneumatic brakes, for railways
 Europe Card Bus, an 8-bit computer bus, used by older Kontron computers and the N8VEM home brew computer project
 Ethylene copolymer bitumen, a type of roofing membrane
 Entity-control-boundary, an architectural pattern in the domain of software engineering

Other uses

 External commercial borrowing, a type of commercial borrowing in India used for the public sector
 Reading electric multiple units, a class of trains