| Official Name: | Chandpur Sadar |
| Native Name: | চাঁদপুর সদর |
| Native Name Lang: | bn |
| Settlement Type: | Upazila |
| Coordinates: | 23.226°N 90.661°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Type2: | District |
| Subdivision Name1: | Chittagong |
| Subdivision Name2: | Chandpur |
| Leader Title: | MP (Chandpur-3) |
| Leader Name: | Dr. Dipu Moni |
| Area Total Km2: | 308.77 |
| Population Total: | 436680 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal Code |
| Postal Code: | 3600 |
| Timezone: | BST |
| Utc Offset: | +6 |
Chandpur Sadar (Bengali: চাঁদপুর সদর) is an upazila of the Chandpur District[1] in the Division of Chittagong, Bangladesh.
According to the 2011 Bangladesh census, Chandpur Sadar Upazila had 98,109 households and a population of 465,919. 109,940 (23.60%) were under 10 years of age. Chandpur Sadar had a literacy rate (age 7 and over) of 56.05%, compared to the national average of 51.8%, and a sex ratio of 1,053 females per 1,000 males. 171,065 (36.72%) of the inhabitants lived in urban areas.[2] [3]
According to the 2001 Bangladesh census,[4] Chandpur Sadar had 85,062 households and a population of 436,680, of whom 49.84% were female. It had an average literacy rate of 57.12%.
The old 1991 census[5] states a population of 396,872, of which only 49.28% were more than 18 years of age, 47.75% were female, and 40.1% literate.
Chandpur Sadar Upazila is divided into Chandpur Municipality and 14 union parishads: Ashikati, Baghadi, Balia, Bishnupur, Chandra, Hanar Char, Ibrahimpur, Kalyanpur, Maishadi, Rajrajeshwar, Rampur, Shakhua, Shah Mahmudpur, and Tarpur Chandi. The union parishads are subdivided into 107 mauzas and 112 villages.
Chandpur Municipality is subdivided into 15 wards and 120 mahallas.[6]