The focus is on discussing innovative social practices that enable urban well-being and quality of life, particularly those addressing environmental issues, which make it possible to shape the urban space as a Smart City. Based on the analysis of primary and secondary data, the proposed discussion will allow for: a) correlating innovative social practices taking place in the urban space of Rio de Janeiro with the concept of Smart Cities; b) discussing to what extent innovative social practices in the field of environmental issues—such as urban waste, basic sanitation, and climate change—can drive significant transformations in urban systems; c) relating Smart Cities to urban well-being and quality of life from the perspective of city residents.