PCT, P.C.T. or pct may refer to:
Math, science and technology pct, an abbreviation for "%" (percentage) PCT theorem, on parity, charge and time inversions Pentachlorotoluene, an aromatic chemical compound Perceptual control theory, a model of behavior Personal Communication Telephone, a mobile telephone service Polychlorinated terphenyl, an industrial chemical Polycyclohexylenedimethylene terephthalate, a thermoplastic polyester Private Communications Technology, an obsolete Internet security protocol Programmable communicating thermostat, California, US term Projected capacitive touchscreen, a type of touchscreen technology
Medicine Patient care technician Person-centered therapy Porphyria cutanea tarda, the most common subtype of porphyria Postcoital test, for infertility Post-coital tristesse Pragmatic clinical trial Primary care trusts, UK NHS bodies 2001–2013 Procalcitonin, a precursor of the hormone calcitonin Progestogen challenge test Proximal convoluted tubule, in the kidney Proton computed tomography (pCT), or proton CT
Places Pacific Crest Trail, US hiking trail from Mexico–US to Canada–US border Potomac Consolidated TRACON, FAA facility designation Princeton Airport (New Jersey), Montgomery Township, New Jersey, US, IATA code
Politics Communist Party of Togo () Congolese Party of Labour () Tunisian Communist Party ()
Other P.C.T, hip-hop musicians Pacific Time (British Columbia), the local name for the UTC−07:00 time zone Paleolithic continuity theory, suggesting the Proto-Indo-European language comes from the Upper Paleolithic Patent Cooperation Treaty, an international patent treaty Pennsylvania College of Technology Phi Chi Theta, fraternity Presbyterian Church in Taiwan Presbyterian Church of Tasmania Production car trial, a type of classic trial or off-road motor car rally Territorial Control Plan (), Salvadoran anti-gang security policy