Duliajan is an industrial town of Dibrugarh district in the Indian state of Assam located in the upper north-east corner of India. The town is about 45 km east of Dibrugarh City. It is particularly known for its oil related industry, Oil India Limited, one of the country's largest oil and gas companies. There is also other central government owned companies like B.C.P.L. GDU Station, N.E.E.P.C.O., D.N.P.L., LPG Plant and the Shivani company which is India's largest private company for drilling. Assam Gas Company Limited, which carries out business related to natural gas in India owned by the Government of Assam, is also located in this township.

Dibrugarh district (Pron:ˌdɪbru:ˈgor:) is a district in the state of Assam in India. The district headquarters are located within the city of Dibrugarh.