Ryūsei Nakao (中尾 隆聖, Nakao Ryūsei?) (born February 5, 1951) is a Japanese actor, singer, and seiyū affiliated with 81 Produce. He was born in the Tokyo Metropolitan area as Tomoharu Takeo (竹尾 智晴, Takeo Tomoharu?).
As a seiyū, he is best known for his roles in Anpanman (Baikinman), Dragon Ball Z (Freeza), Ghost Stories (Kāya), and Bleach (Mayuri Kurotsuchi). Despite his wide range, he is often typecast in roles with odd, cold, twisted, cruel, sadistic, and inhumane characters with wry, slightly high-pitched voices.