Ishii is a Japanese surname. Notable people with the surname include:Ami Ishii, Japanese gravure idol
David Ishii, Japanese-American golfer
Hiroshi Ishii, professor at the Massachusetts Institute of Technology
Hiroshi Ishii (golfer), Japanese golfer
Hisaichi Ishii , Japanese manga artist
Hitoshi Ishii, Japanese mathematician
Kaisei Ishii , Japanese footballer
Kan Ishii, Japanese composer, and the brother of composer Maki Ishii
Katsuhito Ishii, Japanese film director
Kazuhisa Ishii, Japanese baseball player
Kazuyoshi Ishii, Japanese karateka
Ken Ishii, Japanese DJ and music producer
Kentarō Ishii, Japanese shogi player
Kikujiro Ishii (1866–1945), Japanese diplomat who negotiated the Lansing-Ishii Agreement
Kikuyo Ishii , Japanese swimmer
Koichi Ishii, Japanese video game director
Koki Ishii, Japanese footballer
Kouji Ishii, Japanese voice actor
Kunio Ishii, professional Go player
Maki Ishii (1936–2003), Japanese composer, and the brother of composer Kan Ishii
Mario Alberto Ishii, Argentine politician
Masanori Ishii , Japanese actor, comedian and narrator
Satoshi Ishii, Japanese judoka and mixed martial arts fighter
Shigemi Ishii, Japanese footballer
Shiro Ishii (1892–1959), military physician who created and ran Japan's biological warfare program
Shohachi Ishii , Japanese sport wrestler
Sogo Ishii, Japanese film director
Susumu Ishii (1924–1991), second kaicho (Godfather) of the Inagawa-kai yakuza gang in Japan
Takashi Ishii, Japanese film director and screenwriter
Takashi Ishii (baseball), Japanese baseball pitcher and coach
Takeo Ishii, Japanese yodeler
Takuro Ishii, Japanese baseball player
Tatsuya Ishii, Japanese singer, songwriter, artist, and industrial designer
Teruo Ishii (1924–2005), Japanese film director
Tomiko Ishii, Japanese actress
Tomohiro Ishii, Japanese professional wrestler
Tomoo Ishii , Japanese golfer
Tomoya Ishii , Japanese alpine skier
Vania Ishii, Japanese-Brazilian judoka
Yasushi Ishii, Japanese singer and composer
Yoneo Ishii , Japanese historian
Yuka Ishii , Japanese writer
Yuki Ishii, volleyball player