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