The Mro people are considered the original inhabitants of the Chittagong Hills where they migrated from Arakan of Burma from the 14th–15th century. In Bangladesh, they reside in the Chittagong Hills in southeast Bangladesh, primarily in Bandarban District and Rangamati Hill District. They had no written language of their own, but some could read the Burmese and Bangla scripts. Most of them claimed to be Buddhists, but their religious practices were largely animistic, some of them are Krama & Christianity.

Among the distinctive cultural aspects of the Mru is the ploong, a type of mouth- organ made of a number of bamboo pipes, each with a separate reed. Cutting a hole in the ear is called Raiksharam in Mru language. Everybody irrespective of gender has to prick a hole in the ear.

The Mrus perform puja (idol worship) twice a year. Puja is called khang in Mru dialect. Cakes are baked with newly harvested crops in different neighbourhoods. This festival continues for three days. The three-day long Kerai/Kangnat puja is offered throughout the area in the months of Falgun and Ashar twice a year. Basumati puja is offered if there is any epidemic outbreak of disease. 

Approximate 35,000 Mro peoples are living in Bangladesh at this moment.