XP

XP may refer to:

Computing

 * Windows XP, a Microsoft operating system
 * Microsoft Office XP, a version of the software suite
 * Athlon XP, a series of AMD microprocessors
 * Extreme programming, a software development methodology
 * XP (class), a complexity class in parameterized complexity

Medicine

 * Xanthelasma palpebrarum, a cholesterol deposit in the eyelid
 * Xeroderma pigmentosum, a genetic disorder

Other technology

 * Ilford XP, a chromogenic black and white film made by Ilford Photo

Transport

 * Boeing XP-7, a prototype United States biplane fighter of the 1920s
 * Experimental pursuit, a USAAC aircraft designation, used by e.g. the Lockheed XP-38 Lightning
 * Avelo Airlines (IATA code: XP), an American ultra low-cost airline

Other uses

 * XP Inc., a Brazilian investment management company
 * Experience point, a unit for measuring a character's progress in role-playing games


 * XP, an emoticon
 * X phrase, in X-bar theory in linguistics