Đặng Văn Ngữ (1910–1967), was a Vietnamese doctor and intellectual. Ngu was known to be one of the active participators in the Nhân Văn affair in the mid 1950s which saw many middle class intellectuals demanding for freedom and democracy in communist-led North Vietnam.
Ngu was born on the outskirts of Huế on April 4, 1910. In 1937, he graduated from the Indochina Medical University. He became an assistant to the French physician and professor Henry Galliard, dean of the Department of Bacteriology at the school. In 1942, he directed the bacteriology lab and completed 19 research topics. In 1943, he studied in Japan, and became the President of the Patriotic Vietnamese Society in Japan in 1945. In 1949, he returned to Vietnam and joined the Viet Minh resisting against French rule, becoming the lead lecturer in bacteriology in the Medical School at Chiêm Hóa. During his time in the Viet Minh, he successfully researched a method to manufacture penicillin. In 1955, he founded the Vietnamese Institute of Malaria - Bacteriology and Insects, and became its first director. During the Vietnam War, he researched ways to prevent and treat malaria in Vietnam. On April 1, 1967, he was killed in an American bombing in the Annamite Range while in Thua Thien-Hue Province while researching malaria.
He was awarded the Ho Chi Minh Prize for his contributions to medical research.