Special Issue Editors: Mariah Kornbluh and Jennifer Renick “It is a fundamental right of youth and young adults to participate in designing the programs and policies aiming to serve them.” (United Nations, 1989). In recent years, there have been growing calls for the ‘democratization’ of research evidence, which argues for broadening the kinds of evidence that is considered legitimate in informing practice and policy (Doucet, 2019; Kirkland, 2019; Wegemer & Renick, 2021). Within youth-led participatory action research (YPAR), youth conduct systematic research and generate evidence to draw on to advocate for policy and/or programmatic changes (Kornbluh, 2023; Ozer et al., 2020). Such an approach aligns with the push for the democratization of evidence in broadening who are considered legitimate producers of knowledge (Fine & Torre, 2021; Ozer et al., 2020). This special issue will explore the intersections between the use of research evidence to inform policy and YPAR, with the broad goals of studying and strengthening models for impact. In this special issue, we seek scholarship in theoretical frameworks, methodologies, presentations, and case studies that embrace …