The way in which architecture is integrated into a specific environment, but also the way in which this environment is transformed by architecture is generally an inherent feature of the Mediterranean architectural act. This integration in Portugal has been achieved with significant detail and sensitivity, from the scale of the dwelling to the scale of the urban or natural territory. One of the most important features of this process is the integration of urban parameters in the architectural composition. Urbanity can hardly be defined to convey all the meanings it contains, as it is transcribed differently depending on the architect, the context and the architectural program. The purpose of this research thesis is to interpret the characteristics of urbanity and the way in which they are synthetically transcribed in the architecture of the Portuguese architects Alvaro Siza Vieira and João Louis Carrilho da Graça. This thesis is structured in three chapters. In the first there is a brief reference to the theoretical approaches of modern Portuguese architecture, mainly through the work of Alvaro Siza. It then describes the socio-political context before and after the 1974 revolution, and then attempts to delve into the characteristics of the two poles of Portuguese architecture, Porto and Lisbon. The chapter concludes with a reference to the work of the new generation of Portuguese architects. The next two chapters analyze the most important works of Siza and Graça, which interpret the way and the tools with which the characteristics of urbanity are transcribed in the architectural design, in a continuous dialectical relation with the natural-cultural-social context, the city and the architecture. Finally, the different approaches of the two architects, but also of the new generation will be comparatively explored.