Sumiko Iwao (岩男 寿美子, Iwao Sumiko, January 2, 1935 – January 11, 2018) was a Japanese psychologist, educator, editor and professor emeritus at Keio University in Tokyo. She served as the editor-in-chief of Japan Echo, an English-language magazine and predecessor of Nippon.com, from 1997 until 2007, as well as a member of the Echo's editorial board from 1985 until 2007.