| Official Name: | Rangamati Sadar |
| Native Name: | রাঙামাটি সদর |
| 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: | Rangamati |
| Subdivision Type4: | Jatiya Sangsad constituency |
| Subdivision Name4: | Rangamati |
| Established Title: | Formed |
| Seat Type: | Headquarters |
| Seat: | Rangamati Sadar Upazila Complex |
| Governing Body: | Upazila Council |
| Leader Title: | MP |
| Leader Name: | Dipankar Talukdar |
| Leader Title1: | Chairman |
| Leader Name1: | Anna Sadhan Chakma |
| Leader Title2: | Executive officer |
| Leader Name2: | Rifat Asma |
| Area Total Km2: | 546.48 |
| Population Total: | 124728 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Postal Code Type: | Post Code |
| Postal Code: | 4500 |
| Website: | sadar.rangamati.gov.bd |
| Timezone: | BST |
| Utc Offset: | +6 |
Rangamati Sadar (Bengali: রাঙামাটি সদর) is an Upazila of Rangamati District in the Division of Chittagong, Bangladesh.
Rangamati Sadar is located at 22.65°N 92.1833°W. It has a total area 546.48 km2.
As of the 2022 Bangladeshi census, Rangamati Sadar upazila had 35614 households and a population of 146,591. 24,486 (19.63%) were under 10 years of age. Rangamati Sadar had an average literacy rate of 64.5%, compared to the national average of 51.8%, and a sex ratio of 884 females per 1000 males. 84,000 (67.35%) of the population lived in urban areas.[1] The ethnic population was 60,835 (48.77%), of which Chakma were 52,445, Tanchangya 3,149, and Marma 2,309.[2]
Rangamati Sadar Upazila is divided into Rangamati Municipality and six union parishads: Balukhali, Bandukbhanga, Jibtali, Kutukchari, Mogban, and Sapchari. The union parishads are subdivided into 21 mauzas and 178 villages.[1]
See also: Education in Bangladesh. According to Banglapedia, Rangamati Government High School, founded in 1862, and Lakers Public School are notable secondary schools.[3]