This chapter explains how we might use Social Network Analysis (SNA) in studying agreement-making in global environmental governance. It explains a number of the key methodological processes involved in doing SNA, regarding different ways to go about data collection and specific analytical techniques that can be used within SNA that are of particular interest within studies of global environmental governance, such as network structure or the brokerage position of particular individuals or organizations. It also shows how SNA has used by scholars in the field, notably to study patterns of connection within global governance complexes, forms of authority of specific groups of individuals within environmental governance, for example deriving from positions within scientific or professional networks. Finally it makes a number of suggestions about how to thinking about integrating SNA into broader mixed-method studies of agreement-making, including using it as background research prior to visiting negotiating meetings, to identify patterns to be explored in other ways at those sites, as well as to use the negotiating sites themselves to generate accounts of social networks in action in environmental governance.