Tomoharu Takeo (竹尾 智晴, Takeo Tomoharu, born February 5, 1951), known by his stage name Ryūsei Nakao (中尾 隆聖, Nakao Ryūsei), is a Japanese actor, voice actor and singer from Tokyo. He is attached to 81 Produce and worked under the name of Tomoharu Minamiya (南谷 智晴, Minamiya Tomoharu). He is married and has a son and a daughter.

His voice tends to land him in the roles of characters with high-pitched voices and utterly sadistic personalities. As a voice actor, he is best known for his roles in Soreike! Anpanman (as Baikinman), Dragon Ball series (as Tambourine, Frieza, Cooler, Chilled and Frost), Touch (as Ishami Nishimura), Niko Niko Pun (as Porori), Do-Re-Mi-Fa Donuts (as Resshi), Hotch Potch Station (as Echikettojii-san), Moomin (as Sniff), Topo Gigio (as Topo Gigio), Bleach (as Mayuri Kurotsuchi), One Piece (as Caesar Clown), indigo and Beast King GoLion (as Takashi Shirogane)