XP
- 10P (disambiguation)
- 1962 United States Tri-Service aircraft designation system
- Athlon XP
- Avelo Airlines
- Chi Rho
- Experience point
- Extreme programming
- Ilford XP
- List of NATO country codes
- Microsoft Office XP
- PX (disambiguation)
- Windows XP
- X-bar theory
- XP (class)
- XP Inc.
- XPS (disambiguation)
- Xanthelasma palpebrarum
- Xeroderma pigmentosum
- Xp Lee