| Tangail Sadar | |
| Native Name: | টাংগাইল সদর |
| Settlement Type: | Upazila |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Name1: | Dhaka |
| Subdivision Type2: | District |
| Subdivision Name2: | Tangail |
| Seat Type: | Headquarters |
| Seat: | Tangail |
| Area Total Km2: | 334.26 |
| Population As Of: | 2011 |
| Population Total: | 521104 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Timezone: | BST |
| Utc Offset: | +6 |
| Coordinates: | 24.2573°N 89.9278°W |
Tangail Sadar (Bengali: টাঙ্গাইল সদর) is an upazila of Tangail District in the Division of Dhaka, Bangladesh.
Tangail Sadar is located at 24.25°N 89.9167°W. It has 116,922 households and total area 334.26 km2. The upazila is surrounded by Kalihati Upazila on the north, Nagarpur and Delduar Upazila on the south, Kalihati and Basail upazilas on the east, and the Jamuna River on the west.
According to the 2011 Bangladesh census, Tangail Sadar Upazila had 116,922 households and a population of 521,104. 112,157 (21.52%) were under 10 years of age. Tangail Sadar had a literacy rate (age 7 and over) of 53.06%, compared to the national average of 51.8%, and a sex ratio of 1003 females per 1000 males. 167,412 (32.13%) lived in urban areas.[1] [2]
Tangail Sadar Upazila is divided into Tangail Municipality and 12 union parishads: Baghil, Danya, Gala, Gharinda, Hugra, Karatia, Katuli, Kakua, Magra, Mahamudnagar, Porabari, and Silimpur. The union parishads are subdivided into 247 mauzas and 276 villages.[1]
Tangail Municipality is subdivided into 18 wards and 64 mahallas.[1]