Green infrastructure is a key entity in urban planning politics due to its multifunctionality. It performs functions across the three areas of sustainability: environment, society and economy and is therefore crucial for the promotion of sustainability and quality of life. Like all systems, green infrastructure should follow efficiency principles in order to better perform these functions. Consequently, the planning of the green infrastructure must follow a methodology based on these principles, as they will guide its performance. The planning and design of green infrastructure must take into account the functions that each landscape has the capability of performing, because every city has its own character, needs and potential. Since each urban landscape is unique, specific strategies must be found to protect and value the most important socio-ecological elements, in an integrated way. It is important to consider not only the character of the whole metropolis but, at the same time, take each municipality individually, which implies a more complex approach. This chapter presents a methodology for the planning of the green infrastructure in urban landscapes. It consists of a series of steps, applied to a case study in order to demonstrate the functionality, simplicity and processes of the method.