Environmental law and corporate social responsibility (CSR) are increasingly recognized as pivotal in advancing the principles of a circular economy, which emphasizes waste reduction, resource efficiency, and sustainability. This study examines the interplay between legal frameworks and CSR initiatives in fostering circular economy practices. It explores how robust environmental regulations, coupled with corporate accountability, can drive the adoption of sustainable production and consumption patterns. The analysis begins by highlighting the evolution of environmental laws aimed at mitigating the adverse impacts of industrial activities on ecosystems. These laws establish regulatory obligations for businesses to reduce emissions, manage waste, and conserve natural resources. Concurrently, CSR has emerged as a voluntary yet impactful approach that aligns corporate objectives with societal and environmental priorities. When integrated, these mechanisms create a synergistic effect, compelling organizations to innovate and adopt circular economy strategies. This paper investigates case studies across sectors, demonstrating how legal incentives, such as tax benefits and extended producer responsibility (EPR) schemes, encourage businesses to design products with end-of-life considerations. Furthermore, it evaluates the role of international agreements, such as the European Union’s Circular Economy Action Plan, in harmonizing policies and fostering cross-border collaboration. The study also addresses challenges, including regulatory inconsistencies and the financial burden of compliance, which may deter businesses, especially small and medium enterprises (SMEs), from fully embracing circular practices. Recommendations are proposed to strengthen legal frameworks, including the adoption of clear metrics for measuring circularity, fostering public-private partnerships, and enhancing stakeholder engagement in policy formulation. By assessing the impact of environmental laws and CSR on circular economy practices, this study underscores the necessity of an integrated approach. The findings contribute to the discourse on sustainable development, emphasizing the critical role of legal and corporate governance in achieving a resilient and resource-efficient global economy.