This unique, collaborative book, featuring contributions from autistic and non-autistic experts, presents cutting-edge thinking on mental health and service transformation in relation to autistic children and young people (CYP) and their families. Investigating how to implement collaborative approaches to supporting autistic CYP's mental health, this book considers ways for professionals to share power and co-design models of support, promoting self-agency and supportive environments for autistic acceptance and wellbeing.Each chapter includes reflections and vignettes from autistic CYP and allies, key questions and thinking points for readers to consider.The book also includes a link for an e-library with multimedia material with the top take aways for clinicians such as animations, flyers and recorded interviews. The book will be of immense interest to individuals working with autistic CYP and their families in mental health at any level.