Dewanganj (Bengali: দেওয়ানগঞ্জ) is an Upazila of Jamalpur District, Dhaka Division, Bangladesh. It covers an area of 266.59 km² (102.93 sq mi), and is bounded by Char Rajibpur Upazila to the north, Islampur Upazila to the south, Baksiganj Upazila and Meghalaya, India to the east, Gaibandha Sadar Upazila and Phulchhari Upazila to the west.