ERD

Erd can refer to:

*Érd, a city in Hungary

As an acronym, ERD may refer to the following:
* Entity-relationship diagram or entity-relationship model, a diagram or data model for high-level descriptions of conceptual data models
* Emergency Repair Disk used for the Windows NT and Windows 2000 operating system
* Elastic recoil detection an analytical technique
* Emergency Reserve Decoration, a UK Army medal
* Extended Reach Drilling, Technique used by Merlin ERD to drill to oil or gas reservoirs up to 10km (33,000 feet) from the drill site.
* European Realisation Day, is an annual non-political Paneuropean public event sponsored by the Sahajayoga movement.
* EmoRanDDR, a small internet community brought together by a common interest in Dance Dance Revolution.
* Engineering Requirements Document