Hayama (written: 葉山, 羽山, 端山 早山, or 早間) is a Japanese surname. Notable people with the surname include:
- Go Hayama (端山 豪, born 1993), Japanese footballer
- Hiro Hayama (葉山 豪, born 1975), Japanese actor and model
- Ikumi Hayama (葉山 いくみ, born 1984), Japanese voice actress
- Masahiro Hayama (早間 雅博, 1910–?), Japanese ice hockey player
- Peggy Hayama (ペギー 葉山, 1933–2017), Japanese singer
- Reiko Hayama (葉山 レイコ, born 1969), Japanese actress
- Tomoaki Hayama, Japanese mixed martial artist
- Yoshiki Hayama (葉山 嘉樹, 1894–1945), Japanese writer