POS, Pos or PoS may refer to:

Linguistics

* Part of speech, the role that a word or phrase plays in a sentence * Poverty of the stimulus, a linguistic term used in language acquisition and development * Sayula Popoluca (ISO 639-3), an indigenous language spoken in Veracruz, Mexico

Music

* P.O.S (rapper) (born 1981), or Stefon Alexander, American hip hop artist * Pain of Salvation, Swedish progressive metal band * Posdnuos (born 1969), or Kelvin Mercer, New York hip-hop artist

Places

* Port of Spain, Trinidad and Tobago * Piarco International Airport (IATA code), Piarco, Trinidad and Tobago * Pomona (Amtrak station) (Amtrak station code), California, US

Science and technology

* Political opportunity, Political opportunity structure, an approach to explain social movements * Polycystic ovary syndrome, a disease of the ovaries * Probability of success, in statistics * Product of sums, a canonical form in Boolean algebra

Computing

* P/OS, operating system of DEC Professional PCs from Digital Equipment Corporation * Packet over SONET/SDH, a communications protocol for transferring packets over fiber networks * PERQ Operating System, operating system for PERQ workstations * Proof of space, a cryptocurrency blockchain distributed consensus method * Proof of stake, a cryptocurrency blockchain distributed consensus method

Transportation

* Post Office Sorting Van, a type of rail vehicle used in a Travelling Post Office train * SNCF TGV POS, a French high-speed train

Other uses

* Phi Omega Sigma (disambiguation), a Greek name for any of five different student organizations * Piece of shit, a phrase considered vulgar and profane in Modern English * Point of sale, location where payment is accepted * Point of service plan, a type of managed care health insurance plan in the US * Polytechnic Secondary School (''Polytechnische Oberschule''), the 10-year general educational system in East Germany * Priory of Sion, a fictitious secret society * Public open space, a planning term for an outdoor public forum