Research has identified that there is a paucity of reviews covering green public procurement (GPP) in terms of environmentally responsible behavior and sustainability policy adoption. Using, comprehensively, the most recent (2017–2020) and relevant (Web of Science- and Scopus-indexed) empirical sources, our paper fills the gap in the literature by focusing on the main developing streams of research, that is: How GPP drives the circular economy; GPP of construction and building materials; environmental and supply chain management measures in GPP; the procurement of sustainable innovation; environmental policy objectives of GPP as regards energy, pollution, carbon footprint, and climate change; GPP as an environmental policy mechanism for production and use of sustainable goods and services; and GPP as an integral component of sustainable development and performance. Further investigations can explore hot topics related to the role of GPP in the automated algorithmic decision-making processes taking place in data-driven smart sustainable cities because the harnessing, among other things, of sensing and computing technologies, network connectivity systems, and the Cognitive Internet of Things will fulfill the incessant exigencies of public administration.