P.S. commonly refers to:
- Postscript, writing added after the main body of a letter
 
PS, P.S., ps, and other variants may also refer to:
Arts and entertainment
Music
- PS Classics, a record label
 - P.S. (album), a compilation album of film music by Goran Bregovic
 - P.S. (A Toad Retrospective), a compilation album of music by Toad The Wet Sprocket
 - "PS", 2003 song by The Books from the album The Lemon of Pink
 - "P.S.", 1993 song by James from the album Laid
 
Other media
- PlayStation, a video gaming brand owned by Sony
 - PlayStation (console), a home video game console by Sony
 - P.S. (film), a 2004 film
 - P.S., a 2010 film by Yalkin Tuychiev
 - PS (TV series), a German television series
 - PS Publishing, based in the UK
 - Prompt corner or prompt side, an area of a stage
 - Ponniyin Selvan (disambiguation), Indian media franchise, abbreviated PS
 
Language
- Pashto language (ISO 639 alpha-2 language code "ps")
 - Proto Semitic, a hypothetical proto-language ancestral to historical Semitic languages of the Middle East
 - The sound of the Greek letter psi (Greek) (ψ).
 
Places
- Palau (FIPS PUB 10-4 territory code PS)
 - State of Palestine (ISO 3166 country code PS)
 
Politics
- PS – Political Science & Politics, academic journal
 - Parti Socialiste (disambiguation), French
 - Partido Socialista (disambiguation), Spanish and Portuguese
 - Partito Socialista (disambiguation), Italian
 - Polizia di Stato, Italian national police force
 - Positive Slovenia
 - Pradeshiya Sabha, a unit of local government in Sri Lanka
 - Progressive Slovakia Progresívne Slovensko
 - Social Democratic Party (Andorra) Partit Socialdemòcrata
 - Socialist Party of Albania Partia Socialiste
 - Socialist Party of Chile Partido Socialista de Chile
 - Socialist Party of Romania Partidul Socialist [din România]
 - Finns Party Perussuomalaiset
 - Movement of Socialists (Pokret socijalista), a political party in Serbia
 
Religion
Science and technology
Units of measurement
- Petasecond (Ps), 1015 seconds
 - Picosecond (ps), 10−12 seconds
 - Pferdestärke (PS), abbreviation of the German term for metric horsepower
 - Picosiemens (pS), SI unit of electric conductance
 
Computing
- Adobe Photoshop, a graphics editor and creator by Adobe
 - MPEG program stream, an MPEG-2 container format
 - Parametric Stereo, feature used in digital audio
 - PostScript, a page description language
- .ps, filename extension for a file in PostScript format
 
 - ps (Unix), an application that displays statistics on running processes
 - .ps, the State of Palestine Internet domain extension or top-level domain (ccTLD)
 - PS Power and Sample Size, an interactive computer program for power and sample size calculations
 - Windows PowerShell, a command line scripting and system management shell for Microsoft Windows
 
Medicine
- Panayiotopoulos syndrome, a childhood seizure disorder
 - Progeroid syndromes, a group of rare diseases causing premature aging
 - Pulmonary stenosis or pulmonic stenosis, obstruction of the pulmonary artery of the heart
 
Physics and chemistry
- Ps or static pressure, in fluid mechanics and aviation
 - Proton Synchrotron, a 1959 particle accelerator at CERN
 - Chloropicrin, a highly toxic chemical compound
 - Phosphatidylserine, a phospholipid
 - Phosphorothioate (or thiophosphate), a family of compounds and anions with the general chemical formula PS4−xOx3− (x = 0, 1, 2, or 3)
 - Polystyrene, a common type of plastic
 - Ps, positronium, pseudo-chemical symbol
 
Transportation
- Paddle steamer, abbreviated PS in vessel prefixes
 - Pacific Southwest Airlines (1949-1988), IATA designator of former airline
 - Ukraine International Airlines, IATA airline designator since 1992
 
Other uses
- iPhrothiya yeSiliva, a South African military award (Postnominal title: PS)
 - MoMA PS1, an art institution in New York
 - Padma Shri, an Indian civilian award
 - Plastic Surgery, abbreviated as P.S. for simple use
 - Police sergeant
 - Power Stage, a World Rally Championship special stage
 - Power Steering, a device that helps with steering vehicles
 - Power supply
 - Professional services, abbreviated P.S. in name suffixes
 - State school or public school, in the US and other countries
 
See also
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