GBL
- GAMCO Investors
- GB Airways
- GB1 (disambiguation)
- GBI (disambiguation)
- Gainsborough Lea Road railway station
- Game Based Learning
- Game Boy
- Gamit language
- Gamma-Butyrolactone
- Garden-based learning
- Georgian Bay Line
- Glenn A. Black Laboratory of Archaeology
- Golden Baseball League
- Greater Boston League
- Greater Brisbane League
- Greek Basket League
- Groupe Bruxelles Lambert