The chapter “Engaging Adolescents in Secondary Schools,” from the volume School Mental Health Services for Adolescents, covers the topics of student engagement, connections between engagement/disengagement and mental health, and interventions to enhance engagement. Student engagement is a construct with wide appeal to scholars and practitioners who study and work with school-age youth. Engagement interventions have the potential to enhance students’ functioning across academic, behavioral, and social-emotional domains. Tables of student engagement interventions, organized by type (academic, behavioral, cognitive, affective) and level of intensity (universal, targeted), in accordance with response-to-intervention (RTI)/multi-tiered system of support (MTSS) service-delivery models, are included, along with general implementation recommendations.