Onuma, Ōnuma or Oonuma may refer to:
- Onuma (surname), Japanese surname
- Ōnuma District, district of Fukushima Prefecture, Japan
- Ōnuma Station, train station in Hokkaido Prefecture, Japan
- Ōnuma Quasi-National Park, national park in Hokkaido Prefecture, Japan, with a famous pond also called Ōnuma
People with the given name
edit- Onuma Sittirak (born 1986), Thai volleyball player