ZR, Zr, or zr may refer to:
Places by code Zaire, a central African country, 1971–1997 (reserved in ISO 3166), now Democratic Republic of the Congo Zrenjanin, a city in Serbia (on car license plates)
Science and technology
Zirconium, symbol Zr, a chemical element Zona reticularis, an anatomical feature of the adrenal cortex .zr, an abolished Internet top-level domain, for Zaire (now replaced by .cd, for Democratic Republic of the Congo)
Transport Aviation Aviacon Zitotrans (IATA: ZR) A US Navy hull classification symbol: Rigid airship (ZR)
Land transport ZR (bus), a private taxi-bus in Barbados Kawasaki ZR-7, a motorcycle model MG ZR, a hatchback car model Toyota ZR engine, an automotive engine Zambia Railways (ZR, or ZRL), a state rail operator in Zambia
Other uses Nikon ZR, a mirrorless cinema camera , otaku slang for a style of dress ZR, a fictional assistant of the Masked Marvel (Centaur Publications)