Most policies, explicitly or implicitly, involve sharing responsibilities between different organizations, such as departments, government spheres, ministries, or private organizations. Thus, in recent decades, networks have become increasingly common in public policies. The Brazilian health system - given its size and geographic scope - is an example of complexity and sometimes fragmentation in policy implementation. In this context, the government adopts the concept of Healthcare Networks (RASs) in the operation of its health system. A characteristic that defines RASs is their regional character, since it is necessary to go beyond the municipal borders for the optimization of resources. This scenario of interregional relations becomes denser when the territory in question is configured in an urban superstructure, as is the case in metropolitan regions. Thus, this paper proposes the discussion of the case of Healthcare Networks in the Brazilian metropolitan regions and describes, in greater detail, the case of Campinas Metropolitan Region.