This handbook addresses the educational uses of mindfulness in schools. It summarizes the state of the science and describes current and emerging applications and challenges throughout the field. It explores mindfulness concepts in scientific, theoretical, and practical terms and examines training opportunities both as an aspect of teachers’ professional development and a means to enhance students’ social-emotional and academic skills. Chapters discuss mindfulness and contemplative pedagogy programs that have produced positive student outcomes, including stress relief, self-care, and improved classroom and institutional engagement.