Recently, other disciplines and scientific communities discuss the Circular Economy paradigm as a key vehicle to establish more sustainable production and consumption patterns by decoupling eco-nomic output and emissions. Conversations about information system solutions for sustainable pro-duction and consumption, however, remain notably absent in the Information Systems research community. We develop a taxonomy of information flows relevant for the successful application of Circular Economy practices. Drawing on conceptual and empirical data, we categorized nine Circu-lar Economy practices based on their underlying material flow networks and identified four classes of information flows that enable the proper functioning of these practices. Our work (a) provides a conceptual foundation for Circular Economy-related conversations within the Information Systems research community, (b) stimulates future solution-oriented Information Systems research for envi-ronmentally sustainable production and consumption, and (c) strengthens inter-disciplinary re-search.