Positive and effective school discipline is critical to promoting students' successful learning and well-being. This guidance from National Association of School Psychologists (NASP) provides an evidence-based framework for effective school discipline policies and practices that: (1) promote a positive school climate; (2) reinforce positive and prosocial behaviors; (3) promote school safety; (4) keep students in the classroom and out of the juvenile justice system; and (5) addresses and reduces disproportionality in exclusionary discipline practices. School psychologists play an integral role in the collaborative process that includes developing a shared understanding of the key components of effective discipline, the benefits of effective practices, consequences of punitive discipline, and specific steps schools can take to implement effective approaches. This document outlines these key practices and offers federal, state, and local policy recommendations to promote equitable and effective discipline and to reduce the use of suspension, expulsion, and other exclusionary discipline practices, particularly those that disproportionately impact students of color.