Indian Oil Corporation Limited (IOCL), commonly known as IndianOil is an Indian government-owned oil and gas company headquartered in New Delhi. It is the largest commercial oil company in the country, with a net profit of INR 19,106 crore (US$2.848 billion) for the financial the year 2016–17.

It is ranked 1st in Fortune India 500 list for year 2016 and 117th in Fortune Global 500 list of world's largest companies in the year 2019. It was founded on June 30, 1959.

IndianOil's business interests overlap the entire hydrocarbon value-chain, including refining, pipeline transportation, marketing of petroleum products, exploration and production of crude oil, natural gas and petrochemicals.

Indian Oil accounts for nearly half of India's petroleum products market share, 35% national refining capacity (together with its subsidiary Chennai Petroleum Corporation Ltd., or CPCL), and 71% downstream sector pipelines through capacity.

Indian Oil's cross-country pipeline network, for the transport of crude oil to refineries and finished products to high-demand centres, spans over 13,000 km The company has a throughput capacity of 80.49 million tonnes per year for crude oil and petroleum products and 9.5 million cubic metre per day at standard conditions for gas. 

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