Book excerpt: Understanding Mental Health Across Educational Contexts provides an overview of mental health and mental health disorders from a Canadian classroom perspective. Providing definitions and current understandings of mental health challenges and disorders commonly found in K–12 classrooms, this text equips future educators with a toolbox of strategies and resources that they can use inside the classroom. Recognition and support for students and educators struggling with mental health or a mental health disorder has been growing in demand, and this text addresses the importance of this conversation in education while focusing on the interplay of student, teacher, and family. Divided into two sections on core concepts and practical applications, this edited collection covers topics such as mental health disorders frequently encountered within school settings and their relationships with academic achievement, technology, neurodiversity, and career development; Indigenous, queer, and anti-racist practice and praxis; educator mental health and wellness; trauma-informed teaching; and creating mentally healthy classrooms. This essential text is foundational for future educators and those in courses covering child and youth care, exceptional learners, early childhood education, or social work. Courses covering mental health, counselling, or psychology will also find value in this reference guide for common challenges faced by young people or families.