| Official Name: | Feni Sadar |
| Native Name: | ফেনী সদর |
| Settlement Type: | Upazila |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Name1: | Chittagong |
| Subdivision Type2: | District |
| Subdivision Name2: | Feni |
| Population Total: | 512,646 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Area Total Km2: | 226.19 |
| Timezone: | BST |
| Utc Offset: | +6 |
| Coordinates: | 23°N 91°W |
Feni Sadar (Bengali: ফেনী সদর) is an upazila of Feni District in the Division of Chittagong, Bangladesh.[1] The district headquarters and all other administrative offices are located here.
Feni Sadar is located at 23.0167°N 91.3917°W. It has 97,869 households and a total area of 226.19 km2.
As of the 2011 Bangladesh census, Feni Sadar had 97,869 households and a population of 512,646. 113,461 (22.13%) of the inhabitants were under 10 years of age. Fulgazi had an average literacy rate of 62.84%, compared to the national average of 51.8%, and a sex ratio of 1012 females per 1000 males. 156,971 (30.62%) of the population lived in urban areas.[2] [3]
Feni Sadar Upazila is divided into Feni Municipality and 12 union parishads: Baligaon, Chonua, Dholia, Dhormapur, Fazilpur, Forhadnogor, Kalidah, Kazirbag, Lemua, Motobi, Panchgachia, and Sarishadi. The union parishads are subdivided into 134 mauzas and 125 villages.
Feni Municipality is subdivided into 18 wards and 35 mahallas.[4]