Indian Oil Corporation Limited (IOCL) is India's largest commercial oil company, established in 1959 and headquartered in New Delhi. As a government-owned Maharatna company, IOCL operates across the entire hydrocarbon value chain, including refining, pipeline transportation, marketing of petroleum products, exploration and production of crude oil and natural gas, and petrochemicals. With a refining capacity of 80 million metric tons per year, it ranks among the largest refiners globally.

IOCL owns and operates 10 refineries and maintains an extensive network of pipelines for crude oil, petroleum products, and natural gas. The company markets a wide range of products, including petrol, diesel, LPG, lubricants, and various petrochemicals. It also has significant interests in upstream exploration, with operations in both domestic and international oil and gas blocks. With a focus on innovation, IOCL invests in research and development to enhance its offerings in fuels, lubricants, and sustainable energy solutions.