XD may refer to:
- Extreme Definition, an informal term for high-definition television (1440p), distinguished from Extreme High Definition
- xD (emoticon) or "XD", an emoticon used on the internet to express happiness or laughing very hard
- a crude internet abbreviation referring to a "cross-dresser"
- Pokémon XD: Gale of Darkness, a video game developed for the Nintendo GameCube
- Disney XD, a global television brand aimed at older children
- Springfield Armory XD, a line of semi-automatic pistols marketed by Springfield Armory
- XD bit (or NX bit), a security-related computer technology for x86 and x64 processors
- XDCAM, a professional video disc format
- xD-Picture Card, a flash memory card developed by Olympus and Fujifilm
- Hyundai Avante XD, a name for the 3rd Generation of Hyundai Elantra (XD Series) (South Korea)
- Scion xD, a subcompact hatchback sold by Toyota's youth-oriented division Scion
- DOK-ING XD, a future Croatian electric city car made by DOK-ING
- Experience design or User experience design
- Century_Theatres’ Extreme Digital Cinema