ECR
- Change request
- ECR Engines
- East Central Railway zone
- East Coast Radio (Ireland)
- East Coast Radio (South Africa)
- East Coast Rail
- East Coast Road
- East Cross Route
- East Croydon station
- Ed Carpenter Racing
- Efficient Consumer Response
- El Camino Real (disambiguation)
- Electrical contact resistance
- Electron cyclotron resonance
- Electronic Cash Register
- Engine control room
- Engineering change order
- Euro Cargo Rail
- European Congress of Radiology
- European Conservatives and Reformists Group
- European Conservatives and Reformists Party
- List of SamTrans bus lines
- New investigator
- US Institute for Environmental Conflict Resolution