Restorative Justice in Education (RJE) is a positive alternative to zero tolerance disciplinary policies that can help reduce school suspensions and dropouts, reduce revenue losses, and improve the lives of youth and communities. This article describes work to define core practices in Restorative Justice in Education (RJE) efforts in California to enable practitioners to employ standardized concepts and develop programs whose outcomes can be evaluated. One hundred and seventy-four practitioners and stakeholders attended regional meetings to discuss and prioritize promising practices. These discussions were then analyzed, and the concepts were categorized into core and supportive practices in order to develop agreed-upon working definitions. Codification of concepts enables RJE practitioners and stakeholders to develop standardized practices and further RJE’s role in advancing equity in schools.