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PTH may refer to:

  • Parathyroid hormone
  • Parsippany-Troy Hills, New Jersey, a US township
  • Phantom time hypothesis, a proposed theory that a calendar change explains the lack of archaeology coinciding with the Early Middle Ages
  • Phenolphthalein, an indicator used in chemical reactions to indicate the presence of a base
  • Port Huron (Amtrak station), Michigan, United States, station code PTH
  • Protest the Hero, a Canadian progressive metal band from Whitby, Ontario
  • Perth railway station, Scotland, station code PTH
  • GNU Portable Threads, a thread library
  • phenylthiohydantoin, a type of amino acid derivative formed by the Edman degradation
  • Pin through hole, or plated through-hole: see through-hole technology, mounting scheme used in electronics with component leads inserted through drilled holes
  • Polskie Towarzystwo Historyczne, the Polish Historical Society
  • Provincial Trunk Highway: see List of Manitoba provincial highways