| Official Name: | Karnaphuli Sub-District |
| Native Name: | কর্ণফুলী উপজেলা |
| Settlement Type: | Upazila |
| Subdivision Type: | Country |
| Subdivision Name: |  Bangladesh |
| Subdivision Type1: | Division |
| Subdivision Name1: | Chittagong |
| Subdivision Type2: | District |
| Subdivision Name2: | Chittagong |
| Population Total: | 162110 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Area Total Km2: | 55.36 |
| Timezone: | BST |
| Utc Offset: | +6 |
| Coordinates: | 22.3°N 91.9°W |
Karnaphuli (Bengali: কর্ণফুলী) is an Upazila of Chattogram District in Chattogram Division, Bangladesh. Administration Karnaphuli Thana was established on 27 May 2000.[1] [2] Karnaphuli, a police station area under Chattogram's Patiya, has been upgraded to an Upazila.[3]
As of the 2011 Bangladesh census, Karnaphuli upazila had 29,975 households and a population of 162,110. 24,015 (14.81%) were under 7 years of age. Karnaphuli had an average literacy rate of 52.07%, compared to the national average of 51.8%, and a sex ratio of 936 females per 1000 males. The entire population was rural.[4] [5]