This study identifies and analyzes the contributions of Nguyen An Ninh (1900 – 1943) to the Vietnamese patriotic movement from 1919 to 1939. Data were collected from domestic and international studies on Nguyen An Ninh and the Vietnamese patriotic movement during this period. The research results show that Nguyen An Ninh contributed to the dissemination of communism in Vietnam, the establishment, and structuring forces for recruitment into the Communist Party of Vietnam, and the coordination of the La Lutte group. Based on this, he significantly impacted the Vietnamese revolution by promoting the communist tendency within the patriotic movement, contributing to shaping the ideology of national unity, and pioneering the use of the press as a weapon in the struggle against colonialism. This study contributes to clarifying the role of Nguyen An Ninh in the Vietnamese patriotic movement (1919-1939), while also adding documentary basis and perspective to studying the history of thought and the nationalist movement in Vietnam in the early twentieth century.