|| Oil and Natural Gas Corporation Limited (ONGC) is an Indian multinational oil and gas company headquartered in Dehradun, Uttarakhand, India. It is a Public Sector Undertaking (PSU) of the Government of India, under the administrative control of the Ministry of Petroleum and Natural Gas. It is India's largest oil and gas exploration and production company. It produces around 77% of India's crude oil (equivalent to around 30% of the country's total demand) and around 62% of its natural gas.
On 31 March 2013, its market capitalisation was INR 57.2 trillion (US$728 billion), making it India's first largest publicly traded company. In a government survey for fiscal year 2016-17 , it was ranked as the largest profit making PSU in India. ONGC has been ranked 3rd in the Fortune Global 500 list of the world's biggest corporations for the year 2015. It is ranked 1st among the Top 250 Global Energy Companies by Platts.