GCC
- GCCS (disambiguation)
- GNU Compiler Collection
- Galahitiyawa Central College
- Garde côtière canadienne
- Garden City Collegiate
- Gateway Community Church
- Gauhati Cine Club
- Gaussian correlation conjecture
- Gazipur Cantonment College
- Gazipur City Corporation
- Gene Codes Corporation
- General Chiropractic Council
- General Cinema Corporation
- General Computer Corporation
- General Consumer Council for Northern Ireland
- General communication channel
- Genesee Community College
- Georgia Cryptologic Center
- Georgia Cyber Center
- Georgia-Cumberland Conference of Seventh-day Adventists
- Germanna Community College
- Ghirardelli Chocolate Company
- Gibbon Conservation Center
- Gila Community College
- Gillette–Campbell County Airport
- Girls Catholic Central High School
- Glasgow City Council
- Glendale Community College (Arizona)
- Glendale Community College (California)
- Glenorchy Cricket Club
- Global Certification Commission
- Global China Connection
- Global Climate Coalition
- Global capability center
- Global carbon cycle
- Gloucester County College
- Godalming Cricket Club
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- Golden Coast Conference
- Good Counsel College, Innisfail
- Goodwood Cricket Club
- Grace Christian College
- Grace Community Church
- Grand Challenges Canada
- Grand Council of the Crees
- Grand Cross of the Military Order of Christ
- Granger Community Church
- Graphic Communications Conference
- Great Commission Churches
- Great Council of Chiefs
- Greater Chennai Corporation
- Greater Cleveland Conference
- Green-cheeked parakeet
- Greenfield Community College (Massachusetts)
- Greensboro Coliseum Complex
- Greensburg Central Catholic High School
- Greenwich Community College
- Grenville Christian College
- Grove City College
- Guam Community College
- Guanylyl cyclase c
- Gulf Coast Conference
- Gulf Cooperation Council
- Royal Order of Cambodia