Igarashi (五十嵐, "fifty storms") is a Japanese surname. Notable people with the surname include:
Chihiro Igarashi, swimmer
Daisuke Igarashi, manga artist
Fumio Igarashi, figure skater
Hitoshi Igarashi, translator
Kazuo Igarashi, aikido teacher
Koji Igarashi, video game producer and director
Megumi Igarashi, artist
Mitsuru Igarashi, keyboarder and songwriter
Rei Igarashi, actress and voice actress
Ryota Igarashi, a relief pitcher
Satsuki Igarashi, member of Clamp
Shunji Igarashi, actor
Takuya Igarashi, anime director
Toshiyuki Igarashi, light flyweight boxer
Yumiko Igarashi, manga artist and artist