Ōnuki

is a Japanese surname. Notable people with the surname include:

, Japanese pop singer Haru Onuki (1894–1965), American singer , Japanese volleyball player , Japanese rugby union player , Japanese singer and songwriter , Japanese singer

Fictional characters Ami Onuki, a character in the Japanese-American animated television series Hi Hi Puffy AmiYumi, based on the Japanese pop singer by the same name Keiko Onuki, a character in the Battle Royale manga series

See also Ōnuki Station, railway station located in Futtsu, Chiba Prefecture, Japan