Leader self-efficacy (LSE) is associated with leader emergence and effectiveness, and is a strong predictor of both individual and group performance. While some research exists related to the connection between LSE and adult leadership, more studies are required to better understand the details surrounding LSE as it relates to adolescents. This mixed methods study examines the effects of a leadership development intervention on LSE in an eighth-grade student population. Results indicate strong support for the effectiveness of the intervention and its potential to increase youth LSE. This finding holds significant implications for educational practice, research, and the future of leadership development.