Oni

Oni may refer to:

• Oni, Georgia, a town in the Republic of Georgia
• Oni (folklore) (鬼), the demons and ogres of Japanese folklore
• Oni (video game), a third-person shooter video game made by Bungie Studios
• Oni Sakti, professional artist, once known as Atticus Ross
• Oni (novel), a work of fiction by author Marc Olden, about a Russian/Japanese terrorist.

ONI may stand for:

• The Office of Naval Intelligence, the United States Navy's service intelligence center
• The National Olympiad of Informatics (Olimpiada Naţională de Informatică), the most important Romanian informatics competition