ZR may refer to :
- Aviacon Zitotrans IATA code
- MG ZR, a car made by the MG Rover Group
- Toyota ZR engine
- ZR, a mini-van used for mass-transit on the Caribbean island of Barbados (pronounced the British way "Zed"-"R" not "Zee"-"R")
Zr may refer to :
- Zirconium, a chemical element
- .zr, the former Internet country code top-level domain (ccTLD) for Zaire
- USS Shenandoah (ZR-1), a 1922 United States Navy rigid airship
- ZR-2, a United States Navy rigid airship
- USS Los Angeles (ZR-3), a 1923-24 United States Navy rigid airship
- Kawasaki ZR-7, a motorcycle