The huge growth of population in cities all over the world has forced countries to regulate and manage resources in these places. Therefore, urban waste management, fossil fuel conservation, affordable and resourceful healthcare systems, effective traffic management, government transparency, and other concerns plague the world’s main cities. These issues have prompted the creation of Sustainable Smart Cities, which are innovative, technology-based, and environmentally friendly urban areas. The sustainable smart cities deploy technologies specifically Information and Communication Technologies (ICT) to keep an eye on the community and develop long-term, cost-effective solutions. Thus, for the effective implementation of sustainable smart cities, a stable, secure, inter-operable, and reliable telecommunication network is necessary to enable applications and services in metropolitan areas. Recent advancements in the areas of 5G, 6G, Block chain technology, Internet of Things (IoT), and Artificial Intelligence (AI) are anticipated for working and assisting the creation of sustainable smart cities. This chapter provides an introduction of the elements of sustainable smart cities, as well as an overview of how cities throughout the world have adopted them and projected trends for the next generation of sustainable smart cities.