XP may refer to:

  • Windows XP, an operating system
  • Athlon XP, a series of microprocessors
  • Chi Rho, a Christian symbol
  • Experience point, a unit of measurement in role-playing games
  • Extreme Programming, a software development methodology
  • Xeroderma pigmentosum, a genetic disorder
  • Xtra Airways, IATA code XP
  • A complexity class in parameterized complexity
  • An emoticon
  • Experience, Abbreviation for eXPerience, derived from Windows XP's name.