Chhagalnaiya is a town located in the Feni district of the Chittagong Division in Bangladesh. It serves as the administrative headquarters and primary urban center for the Chhagalnaiya Upazila.
The urban area of Chhagalnaiya is the largest in its respective upazila and ranks as the second most populous town within the Feni district. Geographically, it is situated 14.6 km from the district headquarters of Feni city and 96.6 km from the divisional headquarters of Chittagong. The nearest aviation hub for the town is Shah Amanat International Airport.