As this Handbook documents, a rapidly expanding research base supports positive behavioral interventions and supports (PBIS) as an evidence-based framework for creating environments that facilitate students’ academic, social, emotional, and behavioral well-being. Desired youth and school outcomes may be attainable by applying the PBIS framework to design equitable, positive, safe, and healthy school environments and by implementing systems of support to meet the needs of all students. Since the early 2000s, advocates and PBIS researchers have promoted PBIS as a promising approach to improve conditions of juvenile justice settings and positive outcomes for youth (Nelson et al., 2009, 2010). The juvenile justice system comprises a myriad of services that serve children and youth who commit a crime or engage in behavior disallowed due to the child’s age (e.g., truancy, running away from home, vaping). The juvenile justice system broadly refers to a continuum of services and placements that include disciplinary day schools, probation, diversion programs, short-term residential detention, long-term residential placement (usually in secure care settings), and parole. At each point in the juvenile justice continuum, there exists a unique convergence of legal, education, mental health, and child welfare systems working together to improve outcomes for the at-risk youth they serve.