This study examines the role of Tunisian national organizations in supporting the Algerian Revolution during the period (1954–1962), analyzing the forms of popular support provided alongside the official backing of the Tunisian state. The study addresses the core problem of revealing the nature, mechanisms, and impact of this role in serving the Algerian Revolution, drawing upon French archival documents, Algerian and Tunisian primary sources, and oral testimonies. The findings demonstrate that Tunisian national organizations—headed by the General Union of Tunisian Students (UGET), the General Tunisian Labour Union (UGTT), women's organizations, and the Tunisian Scouts, in addition to professional associations—contributed to supporting the revolution through multifaceted mechanisms. These included political and media mobilization, defending the Algerian cause in regional and international forums, organizing Algerian students and workers, providing refugee relief, fundraising, and supplying headquarters, training, and material and logistical assistance, thereby enhancing the revolution's resilience and continuity. The study concludes that Tunisian national organizations constituted a fundamental pillar in the external support system of the Algerian Revolution, and that their contribution transcended mere moral solidarity to encompass impactful practical roles, as corroborated by French archival records that document colonial surveillance of these activities. Ultimately, understanding Tunisian support for the Algerian Revolution requires incorporating the vital roles of civil society and national organizations as a genuine manifestation of Maghrebi solidarity and an active force in sustaining the revolution until independence.