Testimonio involves bearing witness to the collective experiences of historically marginalized communities, particularly as it relates to their oppression, resistance, and resilience. As an approach, it is an inherently decolonial process since it decenters Eurocentric knowledge and challenges power. Unlike oral history, memoir, or autoethnography, testimonio positions itself as an urgent and political voicing that rejects notions of objectivity and neutrality. Instead, it posits that there exist multiple truths of which each contributes to producing our understanding of a collective reality. Similar to these different practices, testimonio does not have a predictable or set structure as it can take the form of a poem, speech, interview, letter, and so on. Each of these, however, involves a public accounting of human experiences that have the ability to build solidarity. Testimonio finds its formal roots in Latin America; however, as a practice it could be argued that it predates most traditional approaches as it has long existed within indigenous cultures that observe oral traditions and storytelling. Testimonio has been used primarily for movement building and resistance as marginalized groups globally named the oppressive practices of their governments and institutions. Since the late 1990s, testimonio has found a home in education, where scholars have deployed it as a strategy for visibilizing the experiences of people of color and women, especially Chicanas and Latinas. Additionally, testimonio has been adapted as a pedagogical tool, research method, and methodology. In the classroom, testimonio can help reveal the varying experiences and knowledge that students bring into the classroom. As a research method and methodology, testimonio compels researchers to reenvision their role in the research process and their relationship to their participants.