Supervision has become indispensable in the coaching world. Coaches seek it due to the complexity of their work. They value its contribution to performing their work ethically, effectively and to the highest quality standards.Increasingly, organizations require it as a condition. Coach training programs included in their curricula. Global professional associations urge their members to adopt it for quality assurance and discuss making it mandatory for certification.As a groundbreaking contribution to the field, this handbook outlines the conceptual development of coach supervision, maps its inherent dilemmas and addresses the challenges it poses for all involved. Drawing on current insights from multiple disciplines and rooted in international practice, it offers vital information on how to supervise different types of coaches and mentors, the competencies coach supervisors need, the training and the role of professional associations in this area. Concrete models and practical examples demonstrate how supervision strengthens professional competency and safeguards the coaching quality, all from the perspective of desired personal, professional, societal and ecological sustainable development. Activities for the reader encourage self-reflection and putting insights into practice. Recommendations, an extensive bibliography and a structured index facilitate further study into the subject by practitioners, researchers, coaching trainers and policy makers.