Sumio (written: 澄男, 澄夫, 澄雄, 純男, 純生 or 寿美雄) is a masculine Japanese given name. Notable people with the name include:
, Japanese judoka Sumio Harada (born 1960), Japanese wildlife photographer, author, public speaker, and conservationist , Japanese former professional baseball outfielder , Japanese physicist , Japanese classical composer , Japanese politician , Japanese racewalker , Japanese poet , Japanese composer and music producer , Japanese mathematician and engineer