Sustainable product and service development is one of the key foundational elements of sustainable entrepreneurship, and it involves integrating environmental, social, and economic aspects into the center of business innovation. This chapter explores the principles, strategies, and frameworks necessary to design products and services that reduce their ecological footprint while enhancing their social impact. It examines essential concepts such as eco-design, circular economy, lifecycle assessment (LCA), and cradle-to-cradle (C2C) design. The role of stakeholders and their voices in shaping regulatory requirements and consumer demand for sustainable Innovation is also part of this discussion. The chapter also highlights case studies of successful sustainable ventures that align a company’s profit with the planet through the use of green materials and resources, energy-efficient processes, and service-based business models while addressing challenges such as cost, scalability, and greenwashing. It offers a practical method for entrepreneurs to apply. By embedding the theories and principles into valuable applications and case studies, the chapter gives a practical guide for various audiences (entrepreneurs, policymakers, and teachers) to embrace sustainability thinking when developing products and services. Sustainable entrepreneurship is both ethical and moral, and it fosters a competitive dynamic in a changing society.