This innovative Research Handbook answers crucial questions about how individuals and organisations can make a difference towards sustainability. Offering an integrative perspective on sustainability agency, it reviews individual, active, organisational and relational forms of sustainability agency, demonstrating the capacity of individuals and organisations to act toward sustainable futures. The Research Handbook investigates the relationships between agency and sustainability, demonstrating the importance of agency for different types of sustainability challenges, including mitigating environmental change and resource depletion. International contributors offer a multidisciplinary overview of the field, constructing detailed literature reviews on its many angles and variations. Concluding with a consolidative meta-review of sustainability agency, the Research Handbook offers directions for future research in the discipline. Crucial reading for scholars and researchers of sustainability, this cutting-edge Research Handbook is particularly useful for those exploring new avenues for research in relation to agency. It will also benefit graduate students looking for an interdisciplinary perspective in the field, as well as practitioners, advocates and NGOs hoping to understand ways in which sustainability can be enacted in various contexts.