| Official Name: | Bandarban Sadar |
| Native Name: | বান্দরবন সদর উপজেলা |
| Settlement Type: | Upazila |
| Coordinates: | 22°N 92°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Type2: | District |
| Subdivision Name1: | Chittagong |
| Subdivision Name2: | Bandarban |
| Seat Type: | Headquarters |
| Seat: | Bandarban Sadar Upazila Complex |
| Subdivision Type4: | Jatiya Sangsad constituency |
| Subdivision Name4: | Bandarban |
| Governing Body: | Upazila Council |
| Leader Title: | MP |
| Leader Name: | Bir Bahadur Ushwe Sing |
| Leader Title1: | Chairman |
| Leader Name1: | Abdul Quddus |
| Leader Title2: | Executive officer |
| Leader Name2: | Umm Habiba Meera |
| Area Total Km2: | 501.98 |
| Population Total: | 111096 |
| Population As Of: | 2022 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 4600[2] |
| Area Code: | 0361[3] |
| Website: | sadar.bandarban.gov.bd |
| Timezone: | BST |
| Utc Offset: | +6 |
Bandarban Sadar (bn|বান্দরবন সদর) is an upazila of Bandarban District in the Division of Chittagong, Bangladesh.[4]
Bandarban Sadar is located at 22.2333°N 92.1917°W. It has a total area of 501.98 km2.
As of the 2022 Bangladeshi census, Bandarban Sadar upazila had a population of 111,096. The ethnic population was 47,804 (43.03%), of which Marma were 26,628, Mru 7,280, Tanchangya 5,605, Bom 2,748, Tripura 1,771, Chakma 1,664 and Khiang 1,310.
Bandarban Sadar Upazila is divided into Bandarban Municipality and five union parishads: Bandarban, Kuhalong, Rajbila, Suwalak, and Tankabati. The union parishads are subdivided into 16 mauzas and 225 villages.[5]
Bandarban Municipality is subdivided into 9 wards and 69 mahallas.[5]