This chapter explores the critical role of redesigning and reinventing products and business models as the foundation for a successful transition to a circular economy. This transformation involves rethinking product design to ensure adaptability, repairability, and upgradability, essential for extending product lifecycles and promoting sustainability. Key messages include the importance of implementing lifecycle assessment (LCA) techniques to minimize environmental impact and addressing internal challenges such as adapting production processes and retraining staff. The chapter also emphasizes the need for manufacturers to develop circular business models that focus on long-term customer relationships and ongoing services rather than one-time product sales. Efficiently managing reverse logistics, integrating digital technologies like data analytics and IoT, and ensuring regulatory compliance are vital components of this transition. Training and upskilling the workforce and fostering a collaborative ecosystem with suppliers and partners are essential strategies for achieving circular success. This section provides a comprehensive framework for manufacturers to redesign and reinvent their products and business models, setting the stage for a sustainable and economically viable future in the circular economy.