PS1

PS1, Ps 1, PS-1, PS/1 or PS One may refer to:

Arts and entertainment

 * Ponniyin Selvan: I or PS I, a 2022 Indian Tamil language period action-drama film by Mani Ratnam
 * Ponniyin Selvan: I (soundtrack), its soundtrack album by A. R. Rahman

Technology

 * "$PS1", "Prompt String 1" the environment variable in a command-line interface which specifies the command prompt
 * IBM PS/1, IBM Personal System/1 series of home computers
 * Pan-STARRS' first telescope, called PS1
 * PostScript Type 1 Font
 * Prosteyshiy Sputnik 1, the first artificial Earth satellite
 * .ps1, the extension of a Microsoft PowerShell script file

Video gaming

 * PlayStation (console), video game console released by Sony in 1994
 * PS One (console), a miniature version of the original PlayStation released in 2000
 * Phantasy Star (video game), the first in the Phantasy Star series
 * PlanetSide (video game), the first in the PlanetSide MMOFPS video game series

Other uses

 * Photosystem I, the second photosystem in the photosynthetic light reactions of plants
 * MoMA PS1 (derived from "Public School One"), American contemporary art institution
 * The name and designation for several public schools in the New York City Department of Education; see List of public elementary schools in New York City
 * Psalm 1 from the Judeo-Christian Book of Psalms
 * The boxcar in the PS line of post-war standardized freight cars from Pullman-Standard