Although TESOL educators often incorporate autobiographical narrative as pedagogy to develop language and literacy among language learners, research has paid little attention to how immigrant youths’ personal stories relate to advocacy and social justice. This article addresses this gap by investigating and theorizing how student advocacy developed in an autobiographical narrative project, the Immigrant Student Stories Project (ISSP). Using a positioning theoretical lens and an ethnographic approach, the authors focus on students’ participation and voices in their narratives and draw upon interviews and observational fieldnotes across ISSP contexts within and beyond one high school. The authors’ investigation of the ISSP examined what students do with their narratives and how they are positioned both in and outside of a classroom context, which the authors argue have consequences for language learning and social justice. The study found that learners are positioned as legitimate speakers, community members, and advocates when they are afforded opportunities to share their stories publicly, connect their stories with a larger community, and apply their stories as tools for advocacy. This study contributes to TESOL scholarship by exploring student advocacy through the lens of positioning theory and revealing how advocacy, language, and literacy can develop synergistically through storytelling.