It was in critical condition because of the gangrene developed on its leg and the treatment was also being hampered by incessant rain.
The wild elephant, which was rescued 30 hours after being stuck in a swamp in the Chunati area of Lohagara upazila in Chattogram, died on Sunday morning.
The elephant got stuck in the mud of a paddy field at Narisha village on Friday. A team from the Wildlife Division of the Bangladesh Forest Department (DoF) rescued the elephant at around 12:20pm Saturday.
Lohagara DoF officer Mobarak Hossain said the elephant was approximately 70-year-old and weighs about six tonnes.
"We gave the elephant first-aid treatment there. A team of elephant experts was deployed there," he added.
It was in critical condition because of the gangrene developed on its leg and the treatment was also being hampered by incessant rain, he added.
However, forest officials put up a tent to keep the elephant dry and tried hard to save her.
Chunati Wildlife Sanctuary is known for its Asian elephants. It is also a major corridor for the movement of Asian Elephants between Bangladesh and Myanmar.