Shitagau Noguchi (?? ?, Noguchi Shitagau, July 26, 1873-January 15, 1944) was a Japanese entrepreneur who founded the Nichitsu zaibatsu.
Known as the father of electrochemical engineering in Japan, he invested heavily in the development of Korea and Manchukou in cooperation with the Imperial Japanese Army and Navy.
His company was dissolved under the American occupation after World War II, and its successor companies include the Chisso Corporation, and portions of Asahi Kasei, Sekisui Chemical Company, and Shin-Etsu Chemical.