Tinsukia district is one of the 34 administrative districts in the state of Assam, India. The district headquarters is located at Tinsukia town. The district occupies an area of 3790 km2.

The Chutia Kingdom was a late medieval state that developed around Sadiya in present Assam and adjoining areas in Arunachal Pradesh. It extended over almost the entire region of present districts of Lakhimpur, Dhemaji, Tinsukia, and some parts of Dibrugarh in Assam, as well as the plains and foothills of Arunachal Pradesh. The kingdom fell around the year 1524 to the Ahom Kingdom after a series of conflicts and the capital area ruled by the Chutia rulers became the administrative domain of the office of Sadia Khowa Gohain of the Ahom kingdom.