PTH may refer to:
Biology and Medicine Parathyroid hormone phenylthiohydantoin, an amino acid derivative formed by the Edman degradation
Computing GNU Portable Threads in computing Pass the hash attack in computing
Languages Pataxó language, by ISO 639 code Standard Chinese, also known as putonghua and abbreviated PTH
Places Parsippany-Troy Hills, township in Morris County, New Jersey Port Huron (Amtrak station), Michigan, US, station code Perth railway station, Scotland, station code Provincial Trunk Highway in list of Manitoba provincial highways Port Heiden Airport, by IATA code
Other Plated through-hole in PCB through-hole technology Polskie Towarzystwo Historyczne, the Polish Historical Society