TTG may refer to:
Medicine, science and technology edit
- Tissue transglutaminase (tTG), an enzyme
- Tonalite-trondhjemite-granodiorite, a type of rock
- Transmit/receive transition gap in communications
- TTG, a codon for the amino acid Leucine
Video, arts and culture edit
- TTG Studios, Los Angeles, US
Other edit
- Travel Trade Gazette
- Tilhas Tizig Gesheften, also known as the TTG or the TTG Brigade
- Teen Titans Go!