Tangail (Bengali: টাঙ্গাইল জেলা) is a district (Zila) in the central region of Bangladesh. It is the largest district of Dhaka division by area and second largest by population (after Dhaka district). The population of Tangail Zilla is about 3.8 million and its area is 3,414.28 km². The main city of the district is Tangail.