The article defines the essence of the concept of green Smart-City. The basic principles and problems of realization of green Smart-City concept in the EU countries are considered. The incentives, benefits of cities into green Smart-City are analyzed. The main achievements of the EU in providing the concept of green Smart-City are considered. Particular examples of European green Smart-City are analyzed. It is obvious that the cities of Ukraine with their structure: transport networks, zones, nodes, with architecture and urban planning, as well as with the environment are far from foreign, which increasingly meet the requirements of "smart" cities. The urgency of solving this scientific problem is due to the need to find ways to ensure the effectiveness of the proposed measures related to the implementation of urban development projects based on the concept of "smart" city, IT development, solving of environmental problems. The purpose of this study is to form a theoretical and methodological basis for the transformation of Ukrainian cities to the requirements of green SmartCity, taking into account European standards of environmental safety and energy efficiency, demands and priorities of local entrepreneurs. The methodological tools of the study were the methods of comparative analysis, namely the experience of the EU and the USA in the formation of "smart" cities and justification on this basis the feasibility of taking into account the experience of successful examples of urban development strategies around the world. Systematization of literature sources on the areas of different approaches use showed that the cities of Ukraine have ample opportunities for development due to the standards of "smart" cities. The object of the study is the leading "smart" cities in the world, because they are an example for other cities in ensuring the well-being of their inhabitants. The article defines the concept and essence of green Smart-City. Arguments on the possibility and expediency of using the principles of Smart-City in the cities of Ukraine are also summarized. The basic principles and problems of implementation of green Smart-City concept in the EU countries are considered. The incentives, benefits and advantages of transforming ordinary cities into green Smart-City are analyzed. The main achievements of the EU in the field of providing the concept of green Smart-City are considered. Specific examples of European green Smart-City are analyzed.