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

Look up PS1 or PS/1 in Wiktionary, the free dictionary.

• 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

• "$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

• 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

• 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

• PS2 (disambiguation)
• PS (disambiguation)
• Ponniyin Selvan (disambiguation)

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