Recognizing the interdisciplinary debate about the digital devices and infrastructure needed to support the emergence and viability of smart cities, the latter can be considered one of the most challenging topics within recent decades due to its relevant role in supporting and enhancing citizens’ participation in public management. Using a deductive approach, in this paper, we propose a sustainability-based conceptual framework to support both policymakers and managers in better understanding at which level to act to improve citizens’ engagement as a way to ensure sustainable development in smart cities. The purpose of this paper is to explore how citizens’ involvement in smart cities can be steered toward positive attitudes and behaviors within the context of sustainable development. Drawing on a managerial perspective, we aim to provide preliminary reflections about the key role that digital technologies on which smart cities are based can play in promoting effective sustainable development for all.