PSF

• French Social Party (Parti Social Français) (1936–1940), a right-wing nationalist party
• French Socialist Party (Parti Socialiste Français), active since 1969
• Palestinian Popular Struggle Front
• Peoples Students Federation, the youth wing of the Pakistan Peoples Party
• Provisional Sinn Féin, Ireland
• Socialist Party without Borders (Parti Socialiste sans Frontières), a leftist party in Chad

• Public Security Forces the principal law-enforcement arm of the Bahraini Ministry of Interior
• Puntland Security Force, Somalia

• P.S.F. Records, a record label
• Pennsylvania Shakespeare Festival, a professional theatre company
• Professional service firm, a company offering consulting, legal, or other services
• Premium Standard Farms, Inc, a pork producer
• Pressed Steel Fisher, a supplier of British car parts

• Pakistan Science Foundation
• Pharmaciens Sans Frontières
• Phelps Stokes Fund, a non-profit foundation
• Pondicherry Science Forum
• Python Software Foundation

• PC Screen Font, a font format used in Linux systems
• Physical Storage Format, a data format for navigation data
• Portable Sound Format, a file format
• Progressive segmented frame, a scheme to handle progressive scan video using interlaced equipment
• Point spread function, the response of an imaging system to a point source
• Protein Segment Finder, a search engine for the Protein Data Bank
• Protein structure file for molecular dynamics, a chemical file format

• Polysulfone, a high-performance thermoplastic
• Potassium fluorosilicate, specifically when referring to phosphors

• Performance shaping factor, factor which poses a likelihood of influencing the success or failure of the performance of a task
• Posterior spinal fusion
• Prolate spheroidal wave function

• Pounds per square foot, a measure of pressure; see also Pounds per square inch
• Price per square foot

• Pittsfield Municipal Airport (IATA airport code: PSF)

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