Isao Kimura (木村 功, Kimura Isao, 22 June 1923 – 4 July 1981), also known as Kō Kimura, was a Japanese actor. He entered the Haiyūza theatre troupe in 1946. He appeared in several films directed by Akira Kurosawa, including Stray Dog (1949) as Yusa the criminal, and Seven Samurai (1954) as Katsushiro, the youngest of the samurai. During his career he also appeared in several films directed by Mikio Naruse and Yoshishige Yoshida, as well as appearing in the Lone Wolf and Cub film series. In addition to a film career spanning almost thirty years, Kimura founded and directed an acting company which ultimately went bankrupt. He died of esophageal cancer.