Tôn Thất Thiện (1924–2014) was a South Vietnamese nationalist of the post-World War II generation who had the rare distinction of serving and watching at close quarters the two historic leaders of post-World War II Vietnam: presidents Ho Chi Minh in the Viet Minh coalition in 1945–46, and Ngô Đình Diệm 1954–55/1956–59/1963. He played a significant though understated role in the nationalist attempt to preserve a non-Communist Vietnam. He died at his home in Ottawa, Canada on October 3, 2014.