Providing a comprehensive overview of the governance of urban infrastructures, this Companion combines illustrative cases with conceptual approaches to offer an innovative perspective on the governance of large urban infrastructure systems. Contributions by leading scholars in the field present a transdisciplinary approach to the topic, with a global scope. Chapters examine the challenges facing urban infrastructure systems, including financial, economic, technological, social, ecological, jurisdictional and demand. Using novel conceptualizations of urban infrastructure, and examining global cases of specific energy, mobility, water, housing, green and telecommunication systems, the Companion further illustrates how these challenges are interrelated with their governance. Finding efficiency, sustainability, and resilience to be key governance performance indicators, it concludes by highlighting the role that digitalization plays in making cities smarter and argues for the potential of digitalization for large urban infrastructure governance. With global significance, this Companion will be an invaluable read for students and scholars of urban studies, governance and infrastructure. The informative case studies will be an excellent resource for city practitioners, officials and policymakers.