The National Assembly of the Socialist Republic of Vietnam (N.A.; Vietnamese: Quốc hội nước Cộng hoà xã hội chủ nghĩa Việt Nam) is the unicameral parliament and highest organ of state power of Vietnam. The National Assembly is the only branch of government in Vietnam and, in accordance with the principle of unified power, all state organs are subservient to it.

The National Assembly, a 500-delegate unicameral body elected to a five-year term. It normally sits twice a year, or more frequently if called for by the National Assembly Standing Committee. The assembly appoints the president (head of state), the prime minister (head of government), the chief justice of the Supreme People's Court of Vietnam, the head of the Supreme People's Procuracy of Vietnam (or 'Supreme People's Office of Supervision and Inspection'), and the 21-member Government.

Constitutionally, the National Assembly is the highest government organization and the highest-level representative body of the people. It has the power to draw up, adopt, and amend the constitution and to make and amend laws. It also has the responsibility to legislate and implement state plans and budgets. Through its constitution-making powers it defines its own role and the roles of the Vietnamese State President, the Vietnamese Government, the local people's councils and people's committees, the Supreme People's Court, and the Supreme People's Procuracy.

The assembly can replace and remove government ministers, the chief justice of the Supreme People's Court, and the procurator general of the Supreme People's Procuracy. Finally, it has the power to initiate or conclude wars and to assume other duties and powers it deems necessary.

In practice, like its counterparts in other communist states, the National Assembly has been characterized as a rubber stamp the Communist Party of Vietnam (CPV) or as only being able to affect issues of low sensitivity to the regime. The CPV controls nomination and election processes at every level. The CPV has great influence over the executive and exercises control through the 150-member Central Committee, which elects the 15-member Politburo at national party congresses held every five years. All senior government positions are held by members of the party. While vested with great lawmaking and oversight powers on paper, in practice the National Assembly does little more than ratify decisions already made by the CPV and its Politburo.

The precursor of the current National Assembly of Vietnam was the National Representatives' Congress (Đại hội đại biểu quốc dân), convened on August 16, 1945, in the northern province of Tuyên Quang. This Congress supported Viet Minh's nationwide general uprising policy against Japanese and French forces in Vietnam. It also appointed the National Liberation Committee (Uỷ ban dân tộc giải phóng) as a provisional government.

After a series of events which was later called collectively the "August Revolution", Viet Minh seized the power all over the country, and the Democratic Republic of Vietnam (Việt Nam dân chủ cộng hoà) was declared by Hồ Chí Minh in Hanoi on September 2, 1945. On January 6, 1946, the first general election ever in Vietnam was held all over the country in which all people 18 years old or older were eligible to vote.

The first session of the First National Assembly (Quốc hội khoá I) took place on March 2, 1946 with nearly 300 deputies in the Hanoi Opera House. Nguyễn Văn Tố was appointed as the Chairman of the National Assembly's Standing Committee. The First National Assembly approved Hồ Chí Minh as the head of government and his cabinet, and the former Emperor Bảo Đại as "the Supreme Advisor". The second session, Bùi Bằng Đoàn was appointed to be the Chairman of the National Assembly's Standing Committee. Tôn Đức Thắng was Acting Chairman from 1948, and from 1955, when Đoàn died, he was Chairman of the Standing Committee.