Broker organizations are identified as important facilitators of multistakeholder partnerships, which could furthermore support more effective collaboration between different sectors. Brokers can provide platforms to connect different actors and provide a basis for communication and agreement between organizations with diverse cultures and priorities. Beyond simply providing platforms, they can facilitate bridging across organizations by fostering common understanding of the objectives of the partnerships in which they are engaged, and they can support their interaction with expertise and by cultivating trust among partners. This chapter examines the role of the World Bank as a broker organization between, on the one hand, public institutions at the international and domestic level, and, on the other hand, private actors in the development of markets for international greenhouse gas emission credits.