This edited volume fills a critical void by providing the most current and authoritative information on what is known about disciplinary disparities. School exclusion—out-of-school suspension and expulsion in particular—remains a substantial component of discipline in our nation’s schools, and those consequences continue to fall disproportionally on certain groups of learners. The negative consequences of frequent and inequitable use of school exclusion are substantial, including higher rates of academic failure, dropout, and contact with the juvenile justice system. As educators, policymakers, community leaders, and other youth-serving organizations begin the difficult work of creating more equitable school disciplinary systems, the need for effective disparity-reducing alternatives could not be more important. Drawing on the multi-year ground-breaking work of the Discipline Disparities Collaborative, the chapters in this book provide cutting edge knowledge supporting a new national imperative to eliminate race, gender, disability, and sexual orientation-based disciplinary disparities.