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Scholars have spent decades investigating various sources of rebellion, from societal and institutional explanations to individual motivations to take up arms against one's government. One element of the civil war process that has gone largely unstudied from a cross-national perspective is the role preexisting organizations in society play in the formation of rebel groups, principally due to a lack of comparable data on the origins of these armed actors across conflicts. In an effort to fill this gap, we present the Foundations of Rebel Group Emergence (FORGE) dataset, which offers information on the “parent” organizations and the founding processes that gave rise to rebel groups active between 1946 and 2011 in intrastate conflicts included in the Uppsala Conflict Data Program's Armed Conflict Database. The new information on rebel foundations introduced in this research note should help scholars to reconsider …