In Smart Cities Systems, one of the main problems of its development is the integration of different devices and sensors. Many of them are incompatible with each other (different platforms, communication protocols, etc.)

In this paper a Domain Specific Language (DSL) for Smart Cities is presented. This DSL allow to describe the system of a Smart City using domain concepts, without considering platforms, protocols, etc. This DSL has been developed using a Model Driven Approach (MDA). Has therefore been developed a metamodel, adding additional constraints to validate the language and a textual and graphical syntax to enable the modeling of the Smart City System in an easy and simple way.