This book demonstrates how resources taken from positive psychology can benefit both teachers and learners. Positive psychology is the empirical study of how people thrive and flourish. This book explores a range of topics, such as affectivity and positive emotions, engagement, enjoyment, empathy, positive institutions, a positive L2 self-system, as well as newly added Positive Language Education. Some papers in this collection introduce new topics such as the role of positive psychology in international higher education, a framework for understanding language teacher well-being from an ecological perspective, or positive institutional policies in language education contexts. This book demonstrates how resources taken from positive psychology can benefit both teachers and learners. Positive psychology is the empirical study of how people thrive and flourish. This book explores a range of topics, such as affectivity and positive emotions, engagement, enjoyment, empathy, positive institutions, a positive L2 self-system, as well as newly added Positive Language Education. Some papers in this collection introduce new topics such as the role of positive psychology in international higher education, a framework for understanding language teacher well-being from an ecological perspective, or positive institutional policies in language education contexts.