GK or Gk may refer to:
Businesses and organizations
- Gallien-Krueger, an instrument amplifier company
- Gawad Kalinga, an anti-poverty movement based in the Philippines
- Society for Orthodontic Dental Technology (German: Gesellschaft für Kieferorthopädische Zahntechnik), a professional body based in Germany
- Jetstar Japan's IATA designator
Places
- Geilenkirchen, a city in North Rhine-Westphalia, Germany, by vehicle registration code until 1971
- Graham-Kapowsin High School, in Pierce County, Washington
- Greater Kailash, New Delhi, India
- Guernsey (FIPS PUB 10-4 territory code)
Sports
- Goalkeeper
- Goalkeeper (association football)
- Goalkeeper (handball)
- Goal keeper (netball)
- Goalkeeper (water polo)
- Vegas Golden Knights of the National Hockey League
Other uses
- G. K. Chesterton, a Roman Catholic novelist and author
- GK Barry, English influencer and presenter
- Glucokinase, an enzyme that facilitates phosphorylation of glucose to glucose-6-phosphate
- Gōdō gaisha, a type of Japanese business organization
- GK, the gene encoding Glycerol kinase, a phosphotransferase enzyme
- Guntur Kaaram, a 2024 Indian Telugu-language action drama film by Trivikram Srinivas
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