G class
- Australian Standard Garratt
- CIÉ 601 Class
- CIÉ 611 Class
- G-class Melbourne tram
- G-class Sydney tram
- G-class blimp
- G-class destroyer (disambiguation)
- G-class frigate
- G-class landing craft
- G-class submarine (disambiguation)
- G-type main-sequence star
- Google Classroom
- Mercedes-Benz G-Class
- Metropolitan Railway G Class
- NZR G class (1928)
- OOCL G-class container ship
- Power amplifier classes
- SECR G class
- Short G-class
- Tasmanian Government Railways G class
- V/Line G class
- Victorian Railways G class
- WAGR G class