This article investigates the role of transgovernmental networks of national regulators in addressing collective action problems endemic to international cooperation. In contrast to recent work on transgovernmental actors, which emphasizes such networks as alternatives to more traditional international institutions, we examine the synergistic interaction between the two. Building on the broader premise that patterns of “dual delegation” above and below the nation-state enhance the coordinating role of networks of national agencies in two-level international governance, the article examines the formal incorporation of transgovernmental networks into European Union (EU) policymaking. The focus on authoritative rule-making adds a crucial dimension to the landscape of EU governance innovations while connecting to the broader study of transgovernmental networks in international governance. The article develops an analytical framework that maps these incorporated networks across different sectors in terms of function, emergence, and effectiveness. Two case studies of data privacy and energy market regulation are presented to apply and illustrate the insights of this mapping.