GCL
- GCL-Poly
- GNU Common Lisp
- Ganglion cell layer
- Geomview
- Geosynthetic clay liner
- Glassboro–Camden Line
- Global coordination level
- Glutamate–cysteine ligase
- Golf Club of Lebanon
- Government Category List
- Grand Companion of the Order of Logohu
- Grand Cross of the Order of Liberty
- Greater Catholic League
- Grenadian Creole English
- Griffith College Limerick
- Guarded Command Language
- Gul Circle MRT station
- Gulf Coast League
- Gulf Coast Lines