Feni is a city in the Chittagong Division of south-eastern Bangladesh, located in Feni District. It hosts the administrative headquarters of Feni District and Feni Sadar Upazila. At the 2022 Bangladeshi census, the city had a population of 234,350, making it the most populated city in the district and the 18th largest city in Bangladesh. Established in 1958, Feni is the oldest municipality in this region.