Belaichhari (Bengali: বিলাইছড়ি) is an upazila of Rangamati District in the division of Chittagong, Bangladesh.

Belaichhari is bordered by Rangamati Sadar upazila to the north, Kaptai and Rajasthali upazilas to the west, Bandarban district to the south, and Juraichhari upazila, the Indian state of Mizoram and Chin State of Myanmar to the east.

As of the 2022 Bangladeshi census, Belaichhari upazila had a population of 29,540.

The ethnic population was 24,852 (84.13%), of which Tanchangya were 11,452, Chakma 7,882, Marma 2,650, Tripura 1,796, Pankho 498 and Bom 356.

[1] Ethnicity in the Belaichhari Upazila (2022)[1][4] UNO: Jamshed Alam Rana.