Keisuke Okada (岡田啓介 Okada Keisuke; January 20, 1868 – October 7, 1952) was an Imperial Japanese Navy officer and Prime Minister of Japan from 1934 to 1936, wounded in the February 26, 1936 Incident but involved in negotiations for ending the war.
After serving as director of the Naval Personnel and Fleet Control Bureaus, director-general of the Fleet Control Department, and vice navy minister, he became an admiral and commander-in-chief of the Combined Fleet in 1924. In 1927, he assumed the office of navy minister in the Giichi Tanaka cabinet, but in 1929 resigned from that post and became a military councillor. 
He participated in the 1930 London Naval Conference. After serving as the navy minister for the Saito cabinet in 1932, he assumed the office of prime minister and colonial affairs minister concurrently in 1934. He was affiliated with the Strike-South Faction.
February 26 and aftermath
His son-in-law was the postwar statesman Hisatsune Sakomizu.
- Okada, Keisuke, National Diet Library
- Bergamini, p. 634