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XP may refer to:

• Windows XP, an operating system by Microsoft
• Experience points, in a role-playing game, representation of a character's advancement and improvement in skills
• Athlon XP, a line of central processing units by AMD
• Extreme Programming
• Xeroderma pigmentosum, a rare genetic disorder
• A two-character emoticon representative of a sick or dying person, of extreme laughter of a topic where it becomes so humorous that you would make yourself sick. "XP" may also represent a figure squinting while sticking out their tongue
• Cross-platform ("X" looks like a saltire cross and is often used to replace this word or its synonyms in abbreviations)
• The Greek letters ΧΡ (Chi Rho), that form the Labarum, the symbol that the emperor Constantine I saw in the sky before the Battle of the Milvian Bridge in 313. The first two letters of Christ in Greek, therefore symbolic of Christianity. See Christogram, Names and titles of Jesus