This chapter addresses the topic of case management and the role of the case manager in psychiatric-mental health nursing practice. Case manager roles typically include advocate, consultant, educator, liaison, facilitator, mentor, and researcher. The chapter provides a definition for case management and traces the historical evolution of psychiatric case management. It reviews the key psychiatric case management models and the goals, principles, and skills involved in the case management process. The case management process involves the following functions: assessment, planning, implementation, coordination, monitoring, and evaluation. Case management is associated with the reduction of symptoms as well as a decrease in hospitalization. The chapter integrates the interpersonal process with case management and describes the roles of the psychiatric-mental health nurse (PMHN) case manager. It finally provides a description of how case management relates to quality of care.