The acronyms Gtg, GTG, or gtg can refer to:
- 'Gordon the Gandu', SFIT
- 'Good To Go', Good To Go meaning 'everything is okay' in Military slang
- 'Got To Go', a farewell in texting slang
- Engineering, science and technology
- Gauge theory gravity
- Gas Turbine Generator (GTG), an electrical generator powered by a gas turbine
- GGT1, Gamma-glutamyl transferase, an enzyme that catalyzes the reaction between a peptide and an amino acid
- Geophysical Tomography Group, Geophysical Tomography Group, was part of the Institut de Physique du Globe de Paris (Jussieu Campus)
- Grey to Grey, a measure of response time in LCD displays
- Grand Theft Gentoo, an in-development indie game
- Good Times Gang (The), Clubs
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