Smart cities providing a large amount of data and information in different dimensions make the complicated process of impact assessment and management of megaprojects feasible. The management and control of megaprojects as costly, long-term, and large-scale developments are critical to their success. In addition, they can facilitate data management in smart cities as they usually use new and innovative technologies, and can provide the integrable data. This chapter tries to propose a framework for megaprojects’ management in smart cities via reviewing the dimensions and the existing data categories and domains in smart cities to enable the megaprojects to smartly react to the risks; smartly manage the energy, service and space usage; and smartly control their footprint. Thus, the concept of smart megaprojects is introduced, and the related challenges in safety and security are discussed. © 2019 Elsevier Inc. All rights reserved.