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OS, O.S., Os, O's, or os may refer to:

See also[edit]

  • Object sexuality, sexual attraction to inanimate objects
  • Oral sex, sexual activity involving the stimulation of the genitalia of a sex partner by the use of the mouth, tongue, teeth or throat
  • OutSystems, multinational software company which operates in the agile software development market
  • Per os, a medical term for ingestion by mouth