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.
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