--- - |2+ Background Recent policy in England has called on services for children and young people's mental health and well‐being to develop and deliver local transformation plans to increase the provision of evidence‐based, outcomes‐informed and service user‐informed treatments. The role of local leadership in service transformation is poorly understood, despite evidence suggesting it is key to enacting change. Purpose To understand the role of local leaders and frontline practitioners in service transformation in child and adolescent mental health services. Methodology This study was a secondary analysis of semistructured interviews with n = 20 leaders and n = 29 frontline practitioners in child and adolescent mental health services taking part in a service transformation programme. Results Leaders’ role in service transformation in child and adolescent mental health services (CAMHS) was to: (a) foster impetus for transformation by demonstrating passion and commitment for change, (b) support practitioners in developing microsystem improvements and (c) bridging the organisation's goals with available resources. Conclusions When developing transformation plans for child and adolescent mental health services, local leaders should be transparent about reasoning and processes, enable practitioners to tailor implementation to need and provide ongoing support. Practitioner engagement needs careful planning given its crucial role in enabling collaboration that will facilitate change. - Child and Adolescent Mental Health, EarlyView.