Yukiko Sumiyoshi(住吉 文子Sumoyoshi Yukiko, born October 2, 1982) is a female Japanese manga author. She has been creating manga since her debut title Ten no Otoshimono first released in 2004. She is also notable as the artist for the manga version of Key's visual novel Tomoyo After: It's a Wonderful Life, and she also illustrated the fourth Clannad manga.