The fire at Dhaka is Suhrawardy hospital has been put out after three hours-long effort. No casualty was reported immediately.
Twelve hundred patients have been evacuated safely, Hospital Director said.
Earlier, The fire originated at a storeroom on the first floor of a new building of the hospital around 5:50pm, said Rasel, duty officer of fire control room.
Sixteen firefighting units were trying to extinguish the flame.
The fire had spread to two other floors despite frantic efforts by the firefighters.
It is not still clear what actually caused the fire.