This Element offers a fresh perspective on supporting principals through the collaborative, co-agentic approach of professional supervision.

School leaders work in increasingly complex systems. Alongside leading learning, they daily navigate the needs and expectations of educational departments, teachers, students, parents, society, and themselves. Leadership can therefore be a dynamic vocational calling, but studies show that principals' professional agency, career sustainability, and wellbeing are diminishing. This Element brings a fresh perspective to how educational leaders can be better served and supported by collaborative, co-agentic partnerships at this time. It makes the case for professional supervision, a practice commonplace in clinical and pastoral professions that offers facilitated, action-oriented attention to the interplay of role, 'soul', and context. As a practice-based primer, this Element reclaims supervision against outdated associations with performance management by drawing on interdisciplinary research and the authors' own experience as supervisor partners with principals. It proposes a new schema of professional supervision in education informed by curiosity, unlearning, resonance, and attunement in a rapidly changing world.