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Sumi Shimamoto (島本 須美 Shimamoto Sumi, real name Sumi Koshikawa (越川 須美 Koshikawa Sumi)) is a veteran seiyū born on December 8, 1954 in Kochi, Kochi Prefecture, Japan. After graduating from the Toho Gakuen College of Drama and Music, she joined Gekidan Seinenza, a theatrical acting troupe. She is currently independent of any talent management company.
She is married to Daisuke Koshikawa, one of the founders of the comedy troupe Chibikko Gang.