nō dĭn dyĕm, 1901–63, president of South Vietnam (1955–63). A member of an influential Roman Catholic family, he was a civil servant before World War II and was connected with the nationalists during the war. He repeatedly refused high office with the government of Bao Dai until 1954, when he became prime minister. In 1955 he controlled a referendum that abolished the monarchy and emerged as South Vietnam's ruler. With strong backing from the United States, Diem initially made some progress, but his favoritism toward his family and toward Roman Catholics over Buddhists caused substantial criticism by the early 1960s. Opposition grew as Diem's authoritarianism increased and as South Vietnam's position in the Vietnam War deteriorated. With the apparent connivance of the U.S. government, a group of dissident generals staged a coup in 1963, and Diem was murdered during the takeover.

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