Tani Masayuki

(9 February 1889 – 26 October 1962) was a Japanese diplomat and politician who was briefly foreign minister of Japan from September 1942 to 21 April 1943 during World War II.

Career Tani was a career diplomat before assuming ministerial roles. More specifically, he served at the embassy in France (1918–1923), United States (1927–1930) and Manchukuo (1933–1936). He also worked as counsellor to the Japanese embassy in Xinjing and as ambassador-at-large in China.

He served as vice minister of foreign affairs in the cabinet of Mitsumasa Yonai when appointed under then foreign minister Kichisaburō Nomura on 24 September 1939.

Then Tani served as information chief and also, foreign minister in the cabinet of Hideki Tōjō. During his tenure, Japan continued to encourage a separate peace between Germany and the Soviet Union. After that, he received Shigemitsu's former post of Japanese ambassador in Nanjing to the Reorganized National Government of China.

After World War II, Tani was detained as a suspect of war crimes until December 1948. becoming the third post-war ambassador of Japan to the US.

Personal life Tani was married and had three children, a daughter and two sons.