Youth are infrequently included in planning the health promotion projects designed to benefit them as many of the factors infringing upon youth's health and well-being also limit their engagement in community-based public health promotion projects. This article explores youth engagement in 13 coalitions implementing structural changes meant to reduce HIV transmission among adolescents. There was wide variation of youth membership and involvement across coalitions. Using analytic induction, the authors show that youth engagement was associated with the successful completion of structural change efforts. The authors also describe how youth engagement indirectly facilitated coalitions' success. The authors suggest that youth engagement in planning and conducting structural interventions is itself a valuable structural change.