Ōishi, Oishi or Ooishi is a Japanese surname. Notable people with the surname include:
* , Japanese baseball player
* , Japanese politician of the Democratic Party of Japan
* , Japanese professional wrestler
* , Japanese politician of the Democratic Party of Japan
* , former Japanese football player
* , Japanese footballer
* , retainer of the Ogigayatsu-Uesugi branch of the Uesugi, and the builder of Takiyama Castle
* , Japanese shogi player
* , former Japanese football player
* , career officer in the Imperial Japanese Navy during World War II
* , Japanese footballer
* , Japanese swimmer
* , Japanese photographer
* , the chamberlain of the Akō han in Harima Province, Japan (1679–1701), known as the leader of the forty-seven ''rōnin''
Fictional characters
* Hisako Ōishi, a Japanese schoolteacher in the 1952 novel ''Twenty-Four Eyes'' and the
1954 film adaptation of the same name
* Noriko Ōishi, a central character in the 2023 film ''
Godzilla Minus One
is a 2023 Japanese Epic film, epic ''kaiju'' film written, directed, and with visual effects by Takashi Yamazaki. It is the 37th film in the Godzilla (franchise), ''Godzilla'' franchise, Toho's 33rd ''Godzilla'' film, and the fifth installme ...
''
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Japanese-language surnames