PST or pst may refer to:
Time zones Pacific Standard Time, UTC−08:00 (western North America) Pakistan Standard Time (usually PKT), UTC+05:00 Philippine Standard Time (also PHST or PHT), UTC+08:00
Science and technology Lead scandium tantalate, a ceramic material Partial stroke testing, of valves Penoscrotal transposition, in medicine Personal Storage Table, a file format used in Microsoft applications Planar separator theorem, in graph theory Pocket set theory, in mathematics Post-stall technology, an aircraft control system Program structure tree, in computer programming PstLM, short-term light flicker metric Puccinia striiformis f.sp. tritici, or wheat yellow rust
Economics and taxes Prebisch–Singer thesis, or Prebisch–Singer hypothesis Provincial Sales Tax, a sales tax in some Canadian provinces
Places Trail of Remembrance and Comradeship (), a walkway in Ljubljana, Slovenia Poznań Fast Tram (), Poland Prestonpans railway station, East Lothian, Scotland, a station code
Other uses Norwegian Police Security Service () Planescape: Torment, a 1999 video game Proto-Sino-Tibetan language Social Labour Party (Portuguese: Partido Social Trabalhista), a defunct political party in Brazil , in linguistics, an abbreviation for past tense