GCR
- Common Room (university)
- French Guianese Creole
- Gas-cooled reactor
- Gaylord Container Corporation
- Geocentric Celestial Reference System
- Geological Conservation Review
- Ghost-canceling reference
- Glass City Rollers
- Global Competitiveness Report
- Global Corruption Report
- Global catastrophic risk
- Glucocorticoid receptor
- Gray City Rebels
- Great Central Railway
- Great Central Railway (Nottingham)
- Great Central Railway (heritage railway)
- Green Corn Revival
- Grey component replacement
- Group coded recording
- Revolutionary Communist Group (Lebanon)
- Tianjin Airlines
- Transparency International