Oka (surname)
Oka is a Japanese surname. Notable people with the surname include:
- Asajiro Oka, Japanese zoologist, anatomist and evolutionist
- Ayumi Oka, Japanese actress
- Ayumi Oka, Japanese female tennis player
- Gedong Bagus Oka, Hindu reformer and philosopher in Indonesia
- Hideko Oka, Japanese fencer
- Jūrō Oka, Japanese businessman in whaling
- Kazuo Oka, Japanese voice actor
- Kiyoshi Oka, Japanese mathematician
- Masi Oka, Japanese American actor and digital effects artist
- Oka Rokumon, Japanese sinologist
- Takeshi Oka, Japanese-American chemist and astronomer
- Tomoko Oka, Japanese fencer
Fictional characters
- Oka, a character in the manga series Asobi Asobase
Other people
- Arsene Oka, Côte d'Ivoire football player
