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  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.
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