TPH or tph may refer to: Walther TPH, a semi-automatic pistol made by the German arms manufacturer Walther Tai Po Hospital, a hospital in Tai Po, Hong Kong Tryptophan hydroxylase, an enzyme Total Petroleum Hydrocarbon, an expression of chemical content Table per hierarchy or Single Table Inheritance, a pattern in computer science by which object graphs are mapped onto single database tables Tudor, Pickering, Holt & Co., an investment and merchant bank headquartered in Houston, Texas, USA. tph: trains per hour, a measure of the frequency of passenger rail transport services The Project Hate MCMXCIX, a Swedish metal band Tonopah Airport (IATA: TPH, ICAO: KTPH)