The deceased are Afju Begum, 5, daughter of Ameer Uddin of Purbo Dhol village, Ruma Akhter, 4, daughter of Awlad Mia of the same village, and Jibon Mia, 3, son of Jahed Mia.
Police said the children fell into the pond at the Jame Mosque while playing near it on Wednesday morning.
The doctors declared them dead when locals took them to Habiganj Sadar Hospital.
The hospital’s emergency unit doctor Bolram Puddo confirmed the deaths to the Dhaka Tribune.
Sadar model police station OC Mohammad Nazim Uddin said: “The bodies have been handed over to the family members for burial.