Digboi is a town in the Tinsukia district of the north eastern state of India, Assam. It is located between 27.38° North latitude and 95.63° East longitude at a height of 165 metres (541 feet) above mean sea level. Digboi is known as the Digboi Oil Town because it is here that the first oil well in Asia was drilled. The Assam Oil Company now known as the Indian Oil Company runs its oil refinery in Digboi. Dibrugarh Airport is the closest airport to this oil town.

According to the 2001 census report, Digboi had a population of 20,405 inhabitants. Males constitute 54% of the population and females constitute 46% of the population.In Digboi, 10% of the population is les than six years of age. This oil town has an average literacy rate of 81% which is much higher than the national average literacy rate of 59.5%. The male literacy rate is 85% and the female literacy rate is 77%.

Digboi is the oldest oilfield in the world which is continuously producing oil. It is now a part of the Indian Oil Corporation which has a capacity of about 0.65 MMTPA according to the 2003 records. Digboi is the headquarters of the Assam Oil Division of the Indian Oil Corporation. The Assam Oil Company was formed in 1899 to look after the functioning of the refinery plant which was established in 1901. The Digboi Refinery modernization Project was taken up in order to revamp the technology of the old refinery. ISO-14001 and OHSMC certificate has been awarded to the Digboi refinery.