Bilinen: Oyuncu
Doğum: 5 Temmuz 1973 (53 yaşında)
Doğum yeri: Kyōto, Kyōto Prefecture, Japan

小杉竜一

Ryuichi Kosugi (小杉竜一, Kosugi Ryūichi, born 5 July 1973) is a Japanese comedian born in Kyoto who performs tsukkomi in the comedy duo Black Mayonnaise along with his partner Takashi Yoshida. His standing position is in the left. He is represented by Yoshimoto Kogyo.