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XS1 may refer to:

  • The original designation, XS-1, of the Bell X-1, a supersonic prototype airplane designed and built by the United States in 1945
  • XS-1 (spacecraft), a DARPA experimental spaceplane
  • Fujifilm X-S1, a superzoom digital bridge camera released in November 2011
  • XCore XS1 microprocessor