GMR may refer to:
- Galapagos Marine Reserve
- General Motors Research Laboratories
- GEO-Mobile Radio Interface, an ETSI standard for satellite phones used by ACeS, ICO, Thuraya
- Giant magnetoresistance (physics)
- Giant Monopole Resonance, a high-frequency collective excitation of atomic nuclei
- Glenreagh Mountain Railway, a heritage railway in NSW, Australia
- GMR (cryptography), a digital signature algorithm
- GMR (magazine), a video game magazine
- GMR Group, an Indian infrastructure developer based in Bangalore, India
- Golden-mantled Rosella, a common name for Platycercus eximius elecica, a sub-species of the Eastern Rosella
- Good Morning Revival, fourth album by Good Charlotte
- Great Manmade River, Libya
- Great Midwest Relay, race
- Greater Manchester Radio, the former name of BBC Radio Manchester
- Groupe mobile de réserve, ancestor of the CRS riot police created under Vichy France