The Hubs4Circularity Community of Practice is a network of public and private stakeholders from industries, regions, and cities set up under Horizon Europe to facilitate the building, scaling up, and replicating of ecosystems of industrial and industrial-urban symbiosis as well as circular economy initiatives. Through a digital knowledge platform, this initiative curates knowledge, tools, models, and solutions, making them accessible to the Community of Practice. As part of the project, expert groups and advisory panels will be created to analyse challenges and solutions, exchange best practices, provide policy recommendations, and develop metrics to assess the maturity of regional initiatives in collaboration with Hubs4Circularity demonstration sites.