The transition to a circular economy requires innovation at all levels of society. This insightful Research Handbook is the first comprehensive edited work examining how innovation can contribute to a more circular economy. Illustrating the critical part played by individuals, organisations and system-level actors in the development of circular innovations, this Research Handbook demonstrates that while many firms are working towards a circular economy, most of the innovations are incremental. Hence, the loop is far from closed, and much more radical work remains to be done by both academics and practitioners. The content and structure reflect a multi-level understanding of innovation for a circular economy, with conceptual chapters and strong empirical research with both quantitative and qualitative research designs. Highlighting the urgent need for a circular economy, authors call for more comprehensive and radical innovation efforts to achieve it. This Research Handbook will be an invaluable resource for academics and students of innovation and entrepreneurship, as well as those more broadly interested in the circular economy. Practitioners and policymakers will also find this useful for providing practical examples of how to understand innovation processes and frameworks that contribute to a circular economy.