▁total ▁population ▁of ▁ind igen ous ▁eth nic ▁minor ities ▁in ▁Bang l adesh ▁was ▁estimated ▁to ▁be ▁over ▁ 2 ▁million ▁in ▁ 2 0 1 0 . ▁They ▁are ▁diverse ▁eth nic ▁communities ▁including ▁Tib eto - B ur man , ▁Aust ric ▁and ▁D rav id ian ▁people . ▁▁ ▁Qu ite ▁a ▁few ▁of ▁these ▁groups , ▁such ▁as ▁the ▁Ch ak mas ▁and ▁Mar mas ▁( the ▁largest ▁and ▁second ▁largest ), ▁migr ated ▁to ▁Bang l adesh ▁before ▁the ▁British ▁period ▁from ▁modern ▁Bur ma . ▁O thers ▁migr ated ▁from ▁Central ▁India , ▁where ▁they ▁are ▁referred ▁to ▁as ▁Ad iv asi ▁( Ind igen ous ). ▁Most ▁of ▁these ▁groups ▁are ▁often ▁dis adv ant aged ▁compared ▁to ▁eth nic ▁Beng alis ▁since ▁Bang l adesh ▁was ▁created ▁as ▁a ▁Beng ali ▁nation - state . ▁Eth nic ▁minor ities ▁of ▁Bang l adesh ▁have ▁their ▁own ▁cultural ▁trad itions ▁and , ▁frequently , ▁languages . ▁V ast ▁number ▁of ▁ind igen ous ▁tribes ▁of ▁Bang l adesh ▁are ▁tradition ally ▁Buddh ists ▁and ▁H ind us ▁by ▁faith ▁while ▁others ▁are ▁Christians ▁and ▁anim ists . ▁ ▁Population ▁The ▁primary ▁census ▁report ▁of ▁ 2 0 1 1 ▁gives ▁the ▁number ▁of ▁eth nic ▁population ▁groups ▁of ▁Bang l adesh ▁as ▁ 2 7 . ▁The ▁first ▁is ▁Ch ak ma , ▁consisting ▁of ▁ 4 4 4 , 7 4 8 ▁people ▁while ▁the ▁Mar ma , ▁the ▁second ▁largest ▁eth nic ▁group