| GTG | Gadgets Tech and Game 
| Others |
| GTG | Gain To Grow
| Others |
| GTG | Games To Go
| Others |
| GTG | Gandalf The Grey
| Others |
| GTG | Garry The Goat
| Others |
| GTG | Gas Turbine Generator
| Others |
| GTG | Gay To Gayer
| Others |
| GTG | Generalized Transition Graph
| Others |
| GTG | Generate Test Generator
| Others |
| GTG | Generation to Generation
| Others |
| GTG | Generic Trace Generator
| Others |
| GTG | Genetic Technology Grade
| Others |
| GTG | Genuine Tough Guy
| Others |
| GTG | Geographic Technologies Group
| Others |
| GTG | German Tuning Group
| Others |
| GTG | Gesture Tailgate
| Others |
| GTG | Get the Goat
| Others |
| GTG | Get Through Guides
| Others |
| GTG | Get To Gether
| Others |
| GTG | Get Together GTG
| Others |
| GTG | Get Trapped Girls
| Others |
| GTG | Getting Things GNOME
| Others |
| GTG | Giannattasio Toresco Giannattasio
| Others |
| GTG | Girl to Girl
| Others |
| GTG | Glad To Go
| Others |
| GTG | Global Trace Graph
| Others |
| GTG | Gloucestershire Training Group
| Others |
| GTG | Go To Ground
| Others |
| GTG | Goat To Go
| Others |
| GTG | Going To Gallop
| Others |
| GTG | Golden Tee Golf
| Others |
| GTG | Good Time Gang
| Others |
| GTG | Good To Go
| Others |
| GTG | Got To Get
| Others |
| GTG | Got To Go
| Others |
| GTG | Goth to Girly
| Others |
| GTG | Gran Turismo Garage
| Others |
| GTG | Grantsburg Municipal Airport
| Others |
| GTG | Granville Technology Group
| Others |
| GTG | Graph Theory GLM
| Others |
| GTG | Graphical Turbulence Guidance
| Others |
| GTG | Gray-To-Gray
| Others |
| GTG | Great To Good
| Others |
| GTG | Grey to Grey
| Others |
| GTG | Growing To Greatness
| Others |
| GTG | Guidelines Task Group
| Others |
| GTG | Göteborgsregionens Tekniska Gymnasium
| Others |
| GTG | Technology Group
| Others |
| GTG | Training Training
| Others |