Genichiro Tenryu (天龍源一郎 Tenryū Gen'ichirō), real name Genichiro Shimada (嶋田源一郎 Shimada Gen'ichirō, born February 2, 1950), is a Japanese professional wrestler. At age 13, he entered sumo wrestling and stayed there for 13 years, after which he turned to Western-style professional wrestling. "Tenryu" was his shikona.