Iwasa (written: 岩佐, 岩浅 and 岩朝) is a Japanese surname. Notable people with the surname include:
*, Japanese racing driver
*, Japanese artist
*
Janet Iwasa, American cell biologist and animator
*, Japanese gravure idol
*, Japanese shogi player
*, Japanese idol and singer
*, Japanese boxer
*, Japanese anarchist
*, Japanese general
*, Japanese professional wrestler
*, Japanese academic
{{surname
Japanese-language surnames