Shunichi Matsumoto (松本 俊一, Matsumoto Shun'ichi, June 7, 1897 – January 25, 1987) was a Japanese diplomat.

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Matsumoto served as Japanese Vice Minister of Foreign Affairs at the Cabinet of General Hideki Tōjō in 1942, and Japanese Ambassador to French Indochina from November 1944 to March 1945, shortly before the Japanese authorities took actual control of the area. On March 9, 1945, served French Governor-General Jean Decoux the ultimatum demanding the surrender of the French forces to the Japanese authorities.^[1] Returned himself to Vice Minister of Foreign Affairs at the Cabinet of Admiral Kantarō Suzuki in 1945, at the time of surrender. In this position, he advocated the acceptance of the Potsdam Declaration.^[2]

He was the first Japanese Ambassador to the United Kingdom following the reestablishing of diplomatic relations after the Second World War, serving in that position in 1952-1955. In 1955-1963, he was a member of House of Representatives of Japan. In 1956 took part in negotiations with the Soviet government on establishment of diplomatic relations. In 1967, he was given the Order of the Sacred Treasure.

• Mosukuwa ni Kakeru Niji [Rainbow over Moscow—The Secret Record of Restoring Japan-Soviet Relations] (Asahi Shimbunsha, 1966) - diplomatic memoirs about talks with Moscow 1955-1956