Oki, Ōki, Ooki or Ohki (written: 大木 lit. "big tree") is a Japanese surname. Notable people with the surname include:
, Japanese comedian , Japanese engineer , Japanese statesman , South Korean professional wrestler , Japanese composer , Japanese singer , Japanese footballer , Japanese sprinter , Japanese footballer , Japanese statesman , Japanese footballer and manager , Japanese voice actor , Japanese AV actor and singer
Fictional characters: , a character in the manga series Battle Royale , a character in the manga series Kodomo no Omocha
Oki (written: 沖 lit. "open sea") is also a separate Japanese surname. Notable people with the surname include:
, Japanese jazz musician , Japanese voice actress , Japanese businessman , Japanese actor and singer , Japanese cyclist