Sth is an abbreviation of something. STH or sth may also refer to: STH (gene), a human gene S.T.H., or Straight To Hell, a gay pornography zine Saint Helena, IIGA country code Saint Helena, Ascension and Tristan da Cunha, UNDP country code Season ticket holder, someone who has purchased a season ticket Secretary for Transport and Housing, of the Government of Hong Kong Soil-transmitted helminth, a type of parasitic worm Soil-transmitted helminthiasis, caused by soil-transmitted helminths Somatotropin hormone, or growth hormone Sonic the Hedgehog Southern Line (Auckland) (timetable code: STH), New Zealand Super Treasure Hunt, a designation used on the highly collectible Hot Wheels models