Io

Io or IO may stand for:

• Io (mythology): In Greek mythology, Io (pronounced "EYE oh," though "EE oh" is also acceptable) was the daughter of Inachus, a river god.
• Io (moon): moon of Jupiter.
• Io: In Polynesian mythology (including the Maori), the creator god, see Kiho for more information.
• British Indian Ocean Territory: ISO country code
• Io programming language: a prototype-oriented programming language made by Steve Dekorte.