Der
# Der

Der or DER may refer to:

## Places

* Darkənd, Azerbaijan
* Dearborn (Amtrak station) (station code), in Michigan, US
* Der (Sumer), an ancient city located in modern-day Iraq
* d'Entrecasteaux Ridge, an oceanic ridge in the south-west Pacific Ocean

## Science and technology

* Derivative chromosome, a structurally rearranged chromosome
* Distinguished Encoding Rules, a method for encoding a data object, including public key infrastructure certificates and keys
* Distributed Energy Resources
* ∂, the partial derivative symbol
* Deep energy retrofit, an energy conservation measure

## Organizations

* Digital Education Revolution, former Australian Government-funded educational reform program
* DER rental (Domestic Electric Rentals Ltd), a UK television rentals company
* Documentary Educational Resources, a non-profit film producer and distributor

## Other uses

* Defence (Emergency) Regulations, legal regulations promulgated by the British in Mandatory Palestine in 1945
* Department of Environment Regulation, former Western Australian state government department
* Designated Engineering Representative, an individual appointed to approve, or recommend approval, of technical data to the Federal Aviation Administration
