| Official Name: | Bijoynagar |
| Native Name: | বিজয়নগর |
| Settlement Type: | Upazila |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Name1: | Chittagong |
| Subdivision Type2: | District |
| Subdivision Name2: | Brahmanbaria |
| Population Total: | 290431 |
| Population As Of: | 2022 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Area Total Km2: | 221.17 |
| Timezone: | BST |
| Utc Offset: | +6 |
| Coordinates: | 24°N 91°W |
| Postal Code Type: | Postal code |
| Postal Code: | 3404[2] |
Bijoynagar (bn|বিজয়নগর) is an upazila of Brahmanbaria District in the Division of Chittagong, Bangladesh.[3]
Bijoynagar has 48,617 households and a total area of 221.17km2.
Previously it was a part of Tripura District. In 1618 CE during the reign of Jahangir, his commander in chief Daud Khan occupied this area from the king of Tripura. This locality was renamed as Daudpur Pargana after his name. After the struggle he (Daud Khan) settled here as administrative lord. This pargana was annexed with the pargana Jalalpur (Mymensingh). The British came into Bengal as Dewan (Revenue collector) in 1765 C.E. They created many districts for their administrative purposes. Again they established Tripura as District in 1790. Daudpur Pargana was also a part of Mymensingh. In 1860, the government established Brahmanbaria as sub-division. Daudpur, Sarail, Bejura and Haripur were separated from Mymensingh and submitted to Brahmanbaria. Ershad government promoted Brahmanbaria as Zilla in 1984 from sub-Division (Biplob, 16.4.2017).
According to the 2011 Census of Bangladesh, Bijoynagar Upazila had 48,617 households and a population of 257,247. 76,565 (29.76%) were under 10 years of age. Bijoynagar had a literacy rate (age 7 and over) of 53.41%, compared to the national average of 51.8%, and a sex ratio of 1048 females per 1000 males. 7,619 (2.96%) lived in urban areas.[4]
Bijoynagar Upazila is divided into ten union parishads: Bhudanty, Bishupor, Chandura, Char Islampur, Champaknagar, Harashpur, Ichhapur, Paharpur, Pattan, and Singerbil. The union parishads are subdivided into 164 mauzas and 225 villages.[4]