Ishimaru (written: 石丸 lit. "stone circle") is a Japanese surname. Notable people with the surname include:
Akira Ishimaru (アキラ 石丸, born 1928), Japanese-American engineer and academic
Hiroya Ishimaru (石丸 博也, born 1941), Japanese voice actor
Hajime Ishimaru (born 1890), Japanese painter
Jiro Ishimaru (石丸 次郎, born 1962), Japanese journalist
Kanji Ishimaru (石丸 幹二, born 1965), Japanese actor and singer
Kazunari Ishimaru, Japanese engineer
Kenjirō Ishimaru (石丸 謙二郎, born 1953), Japanese actor
Kiyotaka Ishimaru (石丸 清隆, born 1973), Japanese footballer
Toshihito Ishimaru (石丸 利人, born 1931), Japanese boxer
