Ishiyama is a Japanese surname. Notable people with the surname include:

George Ishiyama (1914–2003), Japanese-American businessman John Ishiyama (born 1960), political scientist Masumi Ishiyama (born 1981), Japanese cricketer

Fictional characters: Yumi Ishiyama, main character from the French animated TV series Code Lyoko and Code Lyoko: Evolution. Principal Ishiyama, secondary character from Danny Phantom Ken Ishiyama, a character in My Hero Academia

See also Ishiyama Hongan-ji, a Japanese building