Bongaigaon district (Prpn:ˈbɒŋgaɪˌgãʊ) is an administrative district in the state of Assam in northeastern India. The district headquarters are located at Bongaigaon. The district occupies an area of 1,093 km2.

Bongaigaon is a town and a municipal board in the Indian state of Assam. Its town area spans across Bongaigaon and Chirang district. It also acts as the district headquarters of Bongaigaon district and commercial and industrial hub of the west part of the state of Assam. The New Bongaigaon Junction railway station is the 12th largest railway station in Northeast Frontier Railway zone which is one of the major railway zones in India.