Over the past four decades, a great deal of tourism studies’, theories and models have emerged concerning host and guest antagonism, tourism area life cycle, risk of tourism saturation and carrying capacity. These have historically informed academic research, practitioners’ thinking and policy and planning interventions. However, these have often appeared to be shifting, rather than addressing the problem. Over the last decade, while many scholars have maintained their interest in the classical debate concerning the impacts of tourism, some have attempted new conceptualisations, while others have converged towards critical narratives promoted by a number of social movements, and have become involved in subsequent discussions on ‘overtourism’ and ‘tourismphobia’. The terms overtourism and tourismphobia have their genesis in the rapid unfolding of unsustainable mass tourism practices and the responses that these have generated amongst academics, practitioners, social movements and grassroots organizations concerned with the detrimental use of urban, rural and coastal spaces, among others, for tourism purposes. The renewed interest in the study of the adverse impacts of tourism, as implied in the term overtourism, is related to a variety of well-established causes. Travel and Tourism in the Age of Overtourism builds on existing knowledge and makes a theoretical and practical contribution the overtourism debate and the system dynamics underlining it. This collection suggests ways to address this from a tourism and planning perspective. It offers critical reflections on the contemporary evolution of tourism development and the implication of such processes on people, places and spaces. The chapters in this book were originally published as a Special Issue of the journal Tourism Planning and Development.