Kaku is a Japanese surname and a masculine Japanese given name. Notable people with the name include:
Surname:
- Michio Kaku (加來 道雄, born 1947), American physicist
- Genji Kaku (郭 源治, born 1956), Taiwanese-born Japanese baseball player
- Tomohiro Kaku (郭 智博, born 1984), Japanese actor
- Kento Kaku (賀来 賢人, born 1987), Japanese actor
- Yuji Kaku (賀来ゆうじ), Japanese manga artist
Given name:
- Kaku Takagawa (高川 格, 1915–1986), Japanese Go player
- Kaku Takashina (高品 格, 1919–1994), Japanese actor
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