This is the first book to explore the full significance of sport fans and fandom from an international and interdisciplinary perspective, across different sports, communities and levels of engagement. It gives a comprehensive overview of the undeniable economic and cultural influence of sport industries for which fans are the driving force. The book examines different theoretical and methodological approaches to the study of fans, including typologies of fandom, and presents cutting-edge discussion across broad thematic areas such as performance and identity, the business of fandom, and fandom and media. It considers the experiences of diverse and marginalized fan groups, with an emphasis on intersectional analysis, and shines new light on key contemporary themes such as fan activism, violence and deviance, mobility and migration, and the transformative effects of digital and social media. This volume includes chapters by many of the leading scholars responsible for having laid the foundation for sport fan research as well as early-career scholars who examine the newest developments in media technologies, legalized betting, gaming, and fantasy sports. Including perspectives from disciplines such as philosophy, sociology, psychology, management, economics, and media studies, this book is essential reading for anybody interested in the study of sport and wider society or fans and subcultures more broadly.