Group cohesion is a topic that has long been important to small group research. In this special issue, we trace the evolution of group cohesion research from the past to the present day. We are reprinting four classic articles on group cohesion that all mark important turning points in the literature, and we conclude with a modern day review of cohesion in the sports context. Together, these articles span the decades of cohesion research, providing interesting insights into how cohesion has been viewed at different points in time, how the field has developed, and how research on group cohesion still can grow.