Kinichiro Sakaguchi (坂口 謹一郎 Sakaguchi Kin'ichirō, November 17, 1897 - December 9, 1994) was a Japanese agricultural chemist and microbiologist.
He was born in Niigata prefecture [1] and in Jōetsu, Niigata, a sake museum has a part of its exhibition dedicated to him. He is the inventor of the Sakaguchi flask, a round-bottom long-neck shake flask.