Metropolitan governance studies have traditionally focused on factors such as effectiveness and efficiency in the provision of public goods and services. Yet, we have recently seen the resurgence of debates around metropolitan democratic governance at the same time as the consolidation of new structures of metropolitan government have occurred in several European countries. In spite of that, there is still an important knowledge gap about metropolitan models of government and metropolitan electoral systems. Through the comparative analysis of metropolitan governments in the United Kingdom, France and Germany we identify four main models: metropolitan presidentialism, localist metropolitan parliamentarism, consolidated metropolitan parliamentarism, and full metropolitan government. Moreover, the comparative analysis shows not only the influence of the respective local institutional contexts in the metropolitan government and electoral systems, but also how these reforms are opportunities to introduce innovative institutional designs. [ABSTRACT FROM AUTHOR]