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

  • Photosystem I, the second photosystem in the photosynthetic light reactions of plants
  • MoMA PS1 (derived from "Public School One"), American contemporary art institution
  • "$PS1", 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
  • .ps1, the extension of a Microsoft PowerShell script file
Video Gaming