Duliajan (Assamese:দুলীয়াজান) is an industrial town located in Dibrugarh District in the upper north-east corner of India. The town is situated about 45 km east of Dibrugarh City. It is particularly known for its oil related industries, Oil India Limited, one of the country's largest oil and gas companies is headquartered in Duliajan, and Assam Gas Company Limited, which carries out business related to natural gas in India, owned by the Government of Assam.