GTG

Gtg, GTG, gtg, or G2G may refer to:


 * Grantsburg Municipal Airport (IATA code)
 * Gauge theory gravity, a theory of gravitation
 * Geophysical Tomography Group, of the Institut de Physique du Globe de Paris
 * G2G Racing, an American stock car racing team
 * GTG, a codon in the DNA codon table for the amino acid valine
 * G2G, government to government, in e-governance