This project report summarizes the history and operations of Indian Oil Corporation Limited (IOCL). IOCL was established in 1964 by merging Indian Refineries and Indian Oil Company to oversee petroleum operations in India. It is now India's largest commercial enterprise and one of the largest petroleum companies in the world, with a network of refineries, pipelines, and fuel stations across India. IOCL's vision is to become a major, diversified, transnational energy company playing a key role in India's oil security and distribution needs.