Ryotaro Sugi (????, Sugi Ryotaro, real name ???? Katsuhiro Yamada) (born 14 August 1944, Kobe) is a Japanese singer and actor.
He is the father of actor Jundai Yamada.
He appeared in Sukima Kaze, which sold over a million copies.
His acting credits include eighteen films.
On television, he specialized in jidaigeki roles, appearing as the first Suke-san in Mito Komon (seasons 1 and 2); his son Jundai Yamada played Kaku-san in the same show (seasons 29 to 31).
He played the lead character in Oedo Sosamo, appearing from 1970-74.
In the 1971–72 season he portrayed Isshin Tasuke in a series of the same name, and from 1975 to 1977 he played Toyama no Kin-san; his Sukima Kaze was the theme song.
With former Miss Universe contestant Hisako Manda he starred in Kenka-ya Ukon (1992–94).