Abstract: This article explores how organizational culture is a powerful yet often misunderstood force that shapes employee engagement, performance, and an organization's success. It provides a framework for leaders to decode their organization's unique culture by examining the underlying assumptions, espoused values, and visible artifacts and behaviors. The article highlights the critical role of leadership in driving cultural evolution through attention allocation, crisis response, selection/promotion criteria, and role modeling. It then outlines concrete steps for leaders to craft their desired culture, such as aligning culture with strategy, reinforcing systems and metrics, communicating priorities, and measuring and adapting over time. Case studies of Toyota and Starbucks illustrate how organizations can transform their cultures to support strategic goals and drive long-term organizational excellence.