Oni (鬼) are the demons and ogres of Japanese folklore.

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Oni is a town in the Republic of Georgia.

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Oni Sakti professional artist, once known as Atticus Ross.

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Oni is also a third-person shooter video game made by Bungie Studios. It was released for Macintosh, Windows and PlayStation in early 2001. The game integrated both hand-to-hand combat and firing long-range weapons.

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Oni (鬼) is also used to describe a special mode in the game Dance Dance Revolution.

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The Office of Naval Intelligence (ONI) is the United States Navy's intelligence arm.

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