PDT may refer to:
Businesses and organisations Paramount Domestic Television, United States television series distributor, now CBS Television Distribution Piedmont Airlines (ICAO airline code), an American regional airline PDT Partners, a hedge fund company in New York City that was formerly the trading division of Morgan Stanley Partido Democrático Trabalhista (Democratic Labour Party), a political party of Brazil Phi Delta Theta, an international fraternity Democratic Labour Party (Brazil), (acronym commonly used is )
Computing PHP Development Tools, an IDE plugin for the Eclipse platform PDT Standard, a Chinese police wireless communications protocol Portable data terminal, a mobile device
Linguistics Prague Dependency Treebank, of the Czech National Corpus Plautdietsch, spoken in Poland and Mexico (ISO 639-3:pdt)
Places Please Don't Tell, a bar in New York City, US Eastern Oregon Regional Airport, US (IATA:PDT)
Science and medicine Patient-delivered therapy Photodynamic therapy, treatment for cancer and wet age-related macular degeneration, involving a photosensitizer, light, and tissue oxygen Population doubling time, a number indicating cell growth in cell cultures Pancreaticoduodenal transplantation (see Pancreas transplantation) 1,3-Propanedithiol, an organosulfur compound
Other uses Pacific Daylight Time (UTC−7), daylight saving time in western North America Pattern day trader, a previous designation for those following a stock-trading style Peter Dengate Thrush, New Zealand barrister Potentially dangerous taxpayer, an American taxpayer the IRS fear violence from