Matsutarō Kawaguchi (川口松太郎, Kawaguchi Matsutarō; 1 October 1899 – 9 June 1985) was a Japanese writer of short stories, novels, dramas and screenplays. He repeatedly collaborated on films of director Kenji Mizoguchi, and his books were adapted by directors such as Mikio Naruse and Kōzaburō Yoshimura.
Source: “Matsutarō Kawaguchi”, English Wikipedia (CC BY-SA 4.0), excerpt