title: Onuma (surname)
text: # Onuma (surname)
  
  Onuma, Ōnuma or Oonuma (written: 大沼 lit. "big swamp", おおぬま in hiragana) is a Japanese surname. Notable people with the surname include:
  
  * Ayako Ōnuma (大沼 綾子, born 1979), Japanese volleyball player
  * Koji Onuma (大沼 幸二, born 1979), Japanese baseball player
  * Shin Ōnuma (大沼 心), Japanese animation and theatre director
  
  Onuma (written: 小沼 lit. "small swamp", おぬま in hiragana) is a separate Japanese surname, though both may be transliterated the same way. Notable people with the surname include:
  
  