The story of Spanish American Modernismo, the first transnational and cohesive literary movement of the Americas, is told through the well-known poetics of the movement, the expansive archive of the journalistic crónica, and the wide network of relationships exhibited in Modernista correspondence. This chapter argues that the genre of autobiography is a Modernista collective adaptation that defined and historicized the movement through innovative and creative means. Modernista autobiography embodies the intersection of poetics, journalistic prose, current events, and cross-cultural intertextuality allowing for popular, widespread prestige from high- and low-brow audiences alike. Writers, representing their cosmopolitan experiences through narrative retellings as well as adaptations of their literary influences through form and stylistic measures, created a new Latin American movement that had a revolutionary impact on literature and culture in the region. These narrative and formalistic influences also created a new intellectual aristocracy by shaping readers and consumers who desired to model their modern experience through a particular collective aesthetic refashioning. Through an analysis of autobiographical texts by Nicaraguan Rubén Darío, Colombian José María Vargas Vila, and Peruvian author Aurora Cáceres, the Modernista autobiography will be read as instrumental in shaping the collective adaptation of and re-mediation of the literary movement itself.