This volume comes at a critical juncture, as global commitments transition from the Millennium Development Goals to Sustainable Development Goals and the wider post-2015 development agenda is being discussed and debated. In these discussions, children and youth have been recognized as one of the nine major groups of civil society whose participation in decision making is essential for achieving sustainable development. There is also a concomitant need for action innovative, evidence-based approaches to addressing entrenched global challenges or wicked problems and engaging youth in those efforts. Within academic discourse, the perspectives and active participation of youth in research has long been debated. It is widely believed that their participation can result in better policy responses and contribute to the development of more relevant and effective interventions and programs to address their needs. However, the engagement of youth in research processes is not without critique; issues such as how to move from tokenism towards authentic participation and empowerment have been critically discussed, and many question if youth can or should even be expected to make change happen. Youth At the Margins: Critical Perspectives and Experiences of Engaging Youth in Research Worldwide brings together a range of critical and empirical contributions from emerging scholars and seasoned academics alike. Each contribution provides a unique perspective on the potentialities and challenges associated with youth engaged research. The chapters presented in this volume strive to critically interrogate and debate important foundational issues to consider when engaging youth in the research process, such as epistemological and methodological considerations. Important insights into the ethical, pedagogical and practical aspects one must contend with can be gleaned from the selection of chapters here; some of which are primarily theoretical and descriptive, whilstothers present empirical data with case examples from around the world. This volume is devoted to showcasing high quality contributions to the scholarly literature on youth engaged research in order to spur further critical debate on the various epistemological, methodological and ethical issues associated with engaging youth in research processes and in addressing intractable global issues. The audience for this volume includes students, researchers and academics within a broad range of fields who are interested in understanding the range of approaches being used worldwide to include youth in research endeavors on issues of global importance including poverty, social exclusion, structural violence, un- and under-employment, education and health.