Ishimaru (written: 石丸 lit. "stone circle") is a Japanese surname. Notable people with the surname include:
, Japanese-American electrical engineer and academic Hajime Ishimaru (1890–1990), Japanese painter , Japanese voice actor , Japanese journalist , Japanese actor and singer Kazunari Ishimaru, Japanese engineer , Japanese actor , Japanese footballer , Japanese boxer
Fictional characters , a character in the visual novel Danganronpa: Trigger Happy Havoc