Koichi Toshima (外島 孝一, Toshima Kōichi; born August 20, 1971) is a Japanese actor, suit actor, voice actor, and presenter from Niigata Prefecture. He is a member of Aslead Company. He was formerly a member of Yu Gekidan, Tsuburaya Productions, and the Tokyo Actor's Consumer's Cooperative Society (Haikyō). Since 2023, he has been running the Uwasa no Voice Bar Don Don in Nogata, Tokyo.