The Nationalist Party of Greater Vietnam (in Vietnamese, Đại Việt Quốc dân đảng), often known simply as Đại Việt or DVQDD, was a nationalist and anti-communist political party and militant organisation that was active in Vietnam in the 20th century. The party continues to be active outside of Vietnam, with the goal of a multi-party democratic government for the country.
The party was founded by Trương Tử Anh, known as "Anh Cả Phương" ("Eldest Brother Phương"). Among the original members were several prominent figures in Vietnam's politics, such as Dr. Phan Huy Quát and Dr. Nguyễn Tôn Hoàn.
During the era of French colonialism, the Đại Việt engaged in military attacks in an effort to gain independence. Some Đại Việt members were trained in Chinese military academies in Yunnan run by the Kuomintang, before the Communist revolution in China. The party was pro-Japanese during World War II, when the Japanese occupied Indochina. After the partition of Vietnam in 1954, the Đại Việt were banned in the communist North Vietnam. They continued to be active in South Vietnam as an opposition to President Ngô Đình Diệm, and were often implicated in coup plots against Diệm, led by Đại Việt officers in the Army of the Republic of Vietnam.
Notable members included: