Rio Natsuki (夏樹 リオ, Natsuki Rio, March 5, 1969 ) is a Japanese voice actress, narrator, and singer from Tokyo. She belongs to the Tokyo Actor's Consumer's Cooperative Society (Haikyō). She is 158 cm tall, weighs 48 kg, and has a blood type A. According to her official profile, her vocal range is mezzo-soprano.