| Official Name: | Delduar |
| Native Name: | দেলদুয়ার |
| Settlement Type: | Upazila |
| Coordinates: | 24°N 89°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Type2: | District |
| Subdivision Name1: | Dhaka |
| Subdivision Name2: | Tangail |
| Leader Title: | Upazila Chairman |
| Leader Name: | Engineer Mahmudul Hasan Maroof |
| Area Total Km2: | 184.54 |
| Population Total: | 207278 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Timezone: | BST |
| Utc Offset: | +6 |
Delduar (Bengali: দেলদুয়ার) is an upazila of Tangail District in the Division of Dhaka, Bangladesh.
Delduar is located at 24.1417°N 89.9667°W. It has 48,227 households and total area 184.54 km2.
According to the 2011 Bangladesh census, Delduar Upazila had 48,227 households and a population of 207,278. 41,018 (19.79%) were under 10 years of age. Delduar had a literacy rate (age 7 and over) of 51.57%, compared to the national average of 51.8%, and a sex ratio of 1060 females per 1000 males. 14,102 (6.80%) lived in urban areas.[1] [2]
Delduar Upazila is divided into eight union parishads: Atia, Delduar, Deoli, Dubail, Elashin, Fazilhati, Lauhati, and Pathrail. The union parishads are subdivided into 123 mauzas and 162 villages.[1]