Lakhimpur district is an administrative district in the state of Assam in India. The district headquarter is located at North Lakhimpur. The district is bounded on the North by Siang and Papumpare districts of Arunachal Pradesh and on the East by Dhemaji District and Subansiri River. Majuli District stands on the Southern side and Biswanath District is on the West.

North Lakhimpur is a city and a municipal board in Lakhimpur district in the Indian state of Assam, about 394 kilometres (245 mi) northeast of Guwahati. It is the district headquarters of Lakhimpur district.