Planning for a sustainable environment, in which human needs are met equitably without harm to the environment, and without sacrificing the ability of future generations to meet their needs requires a robust understanding of the integrated system of society, the natural world, and the alterations humans bring to the environment. Developing this robust understanding of the integrated system is a common interest among Belmont Forum members and is the focus of this Collaborative Research Action Call for proposals. The ultimate goal of the call is to utilize existing Arctic observing systems, datasets and models to evaluate key sustainability challenges and opportunities in the Arctic region, to innovate new sustainability science theory and approaches to these challenges and opportunities, and support decision-making towards a sustainable Arctic environment. The Belmont Forum is a group of the world’s major and emerging funders of global environmental change research and international science councils. It aims to accelerate delivery of the environmental research needed to remove critical barriers to sustainability by aligning and mobilizing international resources. Belmont Forum funding is intended to add value to existing national investments and support international partnership in interdisciplinary and transdiscplinary scientific endeavors.