Sumi Shimamoto (島本 須美, Shimamoto Sumi; born on December 8, 1954 in Kōchi, Kōchi Prefecture, Japan) is a Japanese voice actress. She married Daisuke Koshikawa, and became Sumi Koshikawa (越川 須美, Koshikawa Sumi).
She is also known for voicing Clarisse d'Cagliostro from Lupin III: The Castle of Cagliostro, Nausicaä from Nausicaä of the Valley of the Wind, Kyoko Otonashi from Maison Ikkoku, Ishizu Ishtar from Yu-Gi-Oh! Duel Monsters, Eucliwood Hellscythe from Kore wa Zombie Desu ka? of the Dead, Shokupanman from Soreike! Anpanman, and Princess Leia from the Japanese dub of the original Star Wars trilogy.