Der

Der may refer to:

• Der (Sumer), an ancient city located in modern-day Iraq
• Darkənd, Azerbaijan
• Derivative chromosome, a structurally rearranged chromosome

DER may be an acronym for:

• Federal Aviation Administration Designated Engineering Representatives
• Digital Education Revolution an Australian Government funded educational reform program to provide schools with students in years 9-12 with laptops and high-speed broadband
• DER rental (Domestic Electric Rentals Ltd), a UK television rentals company
• Dearborn (Amtrak station), station code DER, in Michigan, United States
• Distinguished Encoding Rules, a method for encoding a data object, including public key infrastructure certificates and keys
• Documentary Educational Resources, non-profit film producer and distributor
• Distributed Energy Resources
• ∂, the partial derivative symbol