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
 * Derivation (differential algebra) on an algebra A over a field K, the space (module) of which is denoted DerK(A)
 * 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