Tens of thousands of people were marooned on higher ground as flood waters submerged areas around Cox's Bazar and the hilly district of Bandarban.
Read:Nine killed as flash floods hits Balochistan
Local police official Habibur Rahman confirmed the toll to reporters after four more bodies were recovered from a river on Sunday.
Bangladesh - one of the world's most densely populated countries - is highly vulnerable to natural disasters, including cyclones, droughts, floods and earthquakes.
Read:Floods kill 81 in India’s Gujarat state
India, Bangladesh and China are most at risk from river floods, with an increasing number of people threatened because of climate change and economic growth in low-lying regions, a study said in March.
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