The Aceh referendum discourse in 1999 emerged as a significant political movement that reflected the collective aspirations of the Acehnese people amid prolonged conflict and strained relations between Aceh and the Indonesian central government. The discourse gained momentum following widespread dissatisfaction with political marginalization, economic inequality, and allegations of human rights violations during the Military Operations Area (DOM) period. This study aims to analyze the historical development of the Aceh referendum discourse and identify the factors that contributed to its failure. This research employs a qualitative approach by integrating historical methods with oral history. Data was collected through interviews with individuals involved in the referendum movement and were supported by literature reviews, archival materials, and official documents. These sources were critically analyzed to reconstruct historical events and interpret the dynamics surrounding the referendum movement. The findings indicate that the referendum discourse was rooted in long-standing historical grievances and evolved into a broad social movement supported by students, civil society organizations, and sections of the Acehnese community. Despite gaining significant public support, the movement failed to achieve its objectives due to limited political preparedness, the absence of a clear constitutional and legal framework, concerns regarding national disintegration, and strong resistance from the central government. The study contributes to the fields of political history, democracy, and conflict resolution by providing a deeper understanding of how local political aspirations interact with state interests. It also offers insights into the challenges faced by self-determination movements within a unitary state system.