Oni (disambiguation)
- Adesuwa Oni
- Akuma (Street Fighter)
- Ciena Corporation
- El Niño–Southern Oscillation
- Japanese folklore
- List of Gantz characters
- Miye Oni
- My Oni Girl
- National Oceanic and Atmospheric Administration
- Ninjago (TV series)
- Nioh
- Office of National Intelligence
- Office of Naval Intelligence
- Oni
- Oni (Ninjago)
- Oni (Street Fighter)
- Oni (band)
- Oni (letter)
- Oni (video game)
- Oni Gozen
- Oni Press
- Oni, Georgia
- Oni, Maharashtra
- Onimusha
- Oni–Adil
- Ooni
- OpenNet Initiative
- Oxford Nanoimaging
- Oxygen Not Included
- Ready Player Two
- Studio Colorido
- United States
- Urusei Yatsura
- Yoruba people