XD, pronounced "ecks-dee", may refer to:

• Ex-dividend date
• An emoticon commonly used on the internet to express happiness, self-depreciation, laughter, bewilderment, or sarcasm. (Tilted 90 degrees clockwise, X indicates squeezed eyes and D an open laughing mouth.)
• NX bit (sometimes called the XD bit), a security-related computer technology for x86 and x64 processors
• xD-Picture Card, a format of flash memory developed by Olympus and Fuji, and used mainly in their digital camera products
• Pokémon XD: Gale of Darkness, a video game developed for the Nintendo GameCube
• Scion xD, a subcompact hatchback sold by Toyota's youth-oriented division Scion
• Springfield Armory XD, a line of semi-automatic pistols marketed by Springfield Armory
• XDCAM, a professional video disc format.
• Extreme Definition, an informal term used to describe High-definition television (1440p) and distinguish it from Extreme High Definition (XHD).
• Disney XD, short for eXtreme Digitial, a feature of the Disney.com interactive website

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