TGF may refer to: Medicine Tubuloglomerular feedback, a reflex of the nephrons in the kidney Transforming growth factor, either of two classes of polypeptide growth factors (TGF-α and TGF-β) Science Terrestrial gamma-ray flash, a burst of gamma rays produced in the Earth's atmosphere, generally associated with lightning Tidal Generating Force, an effect of gravity responsible for creating tides Trivial Graph Format, a text-based file format for describing graphs Entertainment The Games Factory, video game development software created by Clickteam The Gracious Few, an American rock group from York, Pennsylvania Other Chali language, by ISO 639 code See also