Supervision of Group Psychotherapy: A Training Manual is a new essential resource for training supervisors of group psychotherapy. This manual provides updated general standards and guidelines for supervising group therapy, including those that are unique to various training sites such as private practice, hospitals, mental health agencies, and academic training centers, across disciplines such as social work, counseling, psychology, and psychiatry. The manual includes historical perspectives and foundations, research, theory, ethics, and applied knowledge of group psychotherapy supervision. Integrating theoretical, clinical, and research perspectives, it offers a thorough analysis of the dynamic interplay among supervisor, therapist, and group—key elements in shaping effective supervisors as well as group therapist. It can also be used for supervisors training practitioners to become Certified Group Psychotherapists (CGPs). Filled with concepts considered core knowledge for any group supervisor-in-training, this manual provides the gold standard for group therapy supervision.