নদীচর খাল বিল গজারীর বন, টাংগাইলের শাড়ী তার গর্বের ধন

Tangail (Bengali: টাঙ্গাইল জেলা) formerly a Mohokuma of Greater Mymensingh district is a district (zila) in the central region of Bangladesh. In 1969, Tangail district was created by Tangail Mohokuma from its 237 square kilometers of its land and 3177 square kilometers of land from Mymensingh Mohukuma. It is the largest district of Dhaka division by area and second largest by population (after Dhaka district). The population of Tangail zila is about 3.8 million and its area is 3,414.28 square kilometres (1,318.26 sq mi). The main city of the district is Tangail. It is surrounded by Jamalpur District on the north, the Dhaka and Manikganj Districts on the south, the Mymensingh and Gazipur on the east, and the Sirajganj on the west.

Tangail was a part of Greater Mymensingh till 1969. Tangail was separated from Mymensingh District in order to subdue its dominance. Before the 6 Upazila event, Mymensingh District had a greater economic growth rate than the capital, Dhaka. As the ruler believed, the greater economy cannot exist alongside capital. Greater Mymensingh was separated from Mymensingh's 6 out of 5 Upazila Tangail, Kishorganj, Sherpur, Jamalpur, and Netrokona (now known as District) in order to subdue Mymensingh. To prevent conflict with Dhaka, six sub-districts were elevated to district level. Thus the district of Tangail was formed. The main rivers that cross the Tangail district are the Jamuna, Dhaleshwari, Jhenai, Bangshi, Louhajang, Langulia, Elongjani, Jugni, Pouli, Fotikjani and the Turag.The subdivision of Tangail was established in 1870. It was turned into a district on 1 December 1969. The district consists of 11 municipalities, 108 wards of these municipalities, 109 Union Parishads and 2516 villages.

Tangail district is subdivided into 12 Upazilas.

• Tangail Sadar Upazila
• Sakhipur Upazila
• Basail Upazila
• Madhupur Upazila
• Ghatail Upazila
• Kalihati Upazila
• Nagarpur Upazila
• Mirzapur Upazila
• Gopalpur Upazila
• Delduar Upazila
• Bhuapur Upazila
• Dhanbari Upazila

Tangail has a tropical climate. In winter, there is much less rainfall than in summer. According to Köppen and Geiger, this climate is classified as Aw. The temperature here averages 25.5 °C. About 1872 mm of precipitation falls annually.

Tangail district is flanked on the west by the Jamuna River, which is over 4 miles wide during the rainy season. The Dhaleswari, first an old channel of the Ganges and then of the Brahmaputra, cuts across the southwestern comer of the district on its powerful sweep to join the Meghna near Narayanganj. The old name of Dhaleswari was "Gajghata". It used to flow afterward by the Salimabad channel and then at last by Porabari channel. A part of the eastern boundary of the district runs close to the Banar river. The river Bangshi flows almost down the middle of the district, branching out from the old Brahmaputra to the north from near Jamalpur. Bangshi falls into Dhaleswari near Savar, in Dhaka district. The Bangshi forms a natural barrier to the Madhupur Jungle on the Tangail side, all the way from Madhupur to Mirzapur. It is only fordable at two or three places near Basail on its way to river Meghna. Dhaleswari itself, however, takes out from the Jamuna from inside Tangail district. Among other important rivers of the district, Lohajang is worth mentioning. It flows past the district headquarters of Tangail and is almost dead at present (in moribund condition). Other rivers are Khiru, Nanglai Nadi, Atai, Elengjani, Fatikjani, Bairan and Jhinai. The old Brahmaputra's most important offshoot is the Jhinai; striking off near Jamalpur it rejoins the Jamuna north of Sarishabari, while another branch flows past Gopalpur. Now these subsystems of rivers, viz Bangshi and Banar, and the Lohajang, Khiru, Nangtai Nadi, Atia and Jhinai are dying out because of the shift of the old Brahmaputra river from its former channel to the present Jamuna channel.