ECD may refer to:

• Early childhood development
• Eastern Caribbean dollar
• Eastern Continental Divide in North America
• ECD (gene)
• E. C. Drury School for the Deaf, in Milton, Ontario, Canada
• Electronic Commerce Directive 2000
• Electronic Control Device, a TASER or stun gun
• Economic Crime Department of the City of London Police
• Electron capture detector
• Electron-capture dissociation
• Electronic civil disobedience
• Energy Citations Database, maintained by the United States Department of Energy
• Energy Conversion Devices, an American photovoltaics manufacturer
• English country dance, a type of social dance
• Equine Cushing's disease
• Erdheim–Chester disease
• Expanded criteria donor, a class of organ donors
• Explanatory combinatorial dictionary