Advocacy is a longstanding intervention approach within social work, and the practice of advocacy has had considerable impact in the field of juvenile justice. The practice of advocacy within social work, however, has suffered from poor conceptualization of its scope and implementation. This chapter presents a conceptual framework for advocacy, identifying three types of advocacy: individual cases, community, and class. The chapter discusses commonalities across the three types and sets forth generic principles for advocacy practice in the context of juvenile justice. The chapter concludes that the direction of policy and practice in juvenile justice can be influenced significantly by social workers and others engaged in advocacy. These advocates can play meaningful roles in defining issues, facilitating change, and assuring that quality services are delivered to youths in trouble. The chapter includes discussion questions based on the information presented. Table, references