AbstractCircular business model innovation is about innovating the business model to create superior customer value propositions, while slowing resource loops through products that last longer, closing resource loops, by recycling materials, narrowing the loop by using less material per product and in manufacturing processes, and regenerating resource loops through using renewables and creating benefits for the natural environment. Despite the potential, and emerging circular business model examples by companies, only a limited percentage of products and materials is currently recycled, let alone repaired, or refurbished. This chapter addresses new avenues and game changers for research and practice in circular business model innovation, including: the twin transition of digital and circular economies, slowing the loop and regeneration, collaborative business models, and tools, methods, and impact assessment.