This study includes a literature review on the phenomenon of happy class. The aim of the research is to examine the phenomena of happiness and classroom separately and to identify the intersection and cooperation areas of both concepts. It is emphasised that a happy class supports academic achievement by increasing motivation and improves students' emotional well-being. The happy class phenomenon is in line with the UNESCO happy schools project and aims to improve the impact of classrooms on the basis of student and teacher happiness. The theoretical foundations of the happy class phenomenon refer to rational, natural, open and innovative organisational theories. As a result, a happy class refers to a learning environment in which the goals set are achieved based on the happiness of students, teachers and parents. In this study, the importance of happy classes is emphasised and it is stated that students, teachers and parents should work together because a happy class is a shared responsibility between teachers, students and parents.