GGT
GGT stands for:
- Greatest common factor in mathematics (usually abbreviated to GCD )
- Gamma-glutamyl transferase , an enzyme that transfers the glutamyl residue of glutathione to peptides, see γ-glutamyl transferase
- the IATA airport code of George Town (Bahamas) on Exuma
- German Society for Gerontology , Iserlohn
- Gothaisches Genealogisches Taschenbuch, see Gothaischer Hofkalender