Lean manufacturing is a powerful methodology aimed at improving efficiency, reducing waste, and enhancing overall operational performance. However, organizations often face challenges in quantifying the return on investment (ROI) for lean initiatives. Demonstrating ROI is essential for securing executive buy-in, sustaining momentum, and validating the value of lean transformations. This article outlines the key elements of measuring the ROI of lean manufacturing initiatives, including critical metrics, methodologies, and best practices.