ECR may refer to:
Associations US Institute for Environmental Conflict Resolution European Conservatives and Reformists Party, a European political party European Conservatives and Reformists, the affiliated European Parliament group
Radio East Coast Radio (South Africa), a South African radio station (FM 94-95) East Coast Radio (Ireland), an Irish radio station
Transportation East Central Railway zone, part of the Indian rail network East Coast Rail, Australian rail freight operator
East Coast Road, a scenic coastal road along the Coromandel coast of South India East Cross Route in London East Croydon station, a railway station and tram stop in Croydon, England Euro Cargo Rail, rail freight operator based in France Route ECR, SamTrans bus route, San Mateo County, California, United States
Science and technology Electron cyclotron resonance, a phenomenon in physics European Congress of Radiology
Engineering Electrical contact resistance, the surface-structure-dependent resistance at a contact interface Engineering Change Request, a request for a change in the specification(s) - see Change request or Engineering change order
Other Early Career Researcher ECR Engines, the engine-building division of Richard Childress Racing Ed Carpenter Racing, an American racing team in the IndyCar Series Electronic Cash Register El Camino Real (disambiguation) Engine control room, shipbuilding abbreviation