WS, Ws, or ws may refer to:

  • Samoa, ISO 3166-1 country code
    • .ws, the Internet country code top-level domain for Samoa
  • Western Sahara
  • ws://, the prefix used to indicate WebSocket protocol in an URI
  • WS postcode area, a postcode area in the West Midlands, United Kingdom
  • Watt second (Ws) or Joule, a unit of energy or work
  • Weird Science (film), a 1985 John Hughes film based on the comic book series of the same name
  • Werner syndrome, a rare disorder characterized by premature aging
  • Williams syndrome, a rare genetic disorder
  • Win Shares, a baseball statistic
  • Ware Shoals Railroad's reporting mark
  • WestJet's IATA code
  • Writers to the Signet's post-nomial abbreviation
  • Web service, a method of communication between two electronic devices over a network