Onga may refer to:
- Onga District, Fukuoka, a district of Fukuoka Prefecture, Japan
- Onga, Fukuoka, a town in that district
- Onga, Hungary, a town
- Onga, Gabon, in the department of Djoue
See also
- Oonga (disambiguation)
- Ounga (disambiguation)
- Ongaonga (disambiguation)