Deoria district is one of the districts of Uttar Pradesh state of India, and Deoria town is the district headquarters. Deoria district is a part of Gorakhpur division.

The area now known as the Deoria District was once a part of the Kosala Kingdom - a prime centre of ancient Aryan culture surrounded by the Himalayas in the north, the Shyandika river in the south, the Panchala Kingdom in the west and the Magadh Kingdom in Bihar to the east. Apart from the many legends told about this area, archaeological remains, such as statues, coins, bricks, temples, and Budh Maths, have been discovered at many locations in this district, showing that there was a developed and organised society long ago.

Ancient history of the district is related with the Ramayana times when the Lord of Kosala, Ram, appointed his elder son Kusha the king of Kushwati, which is present-day Kushinagar. Before the Mahabharata era, this area had been related with Chakravorty Samrat Mahasudtsan Mall and his kingdom. Kushinagar was well developed and prosperous. Close to the border of his kingdom was the thick forested area called the Mahavan. This area was under the control of the Maurya rulers, the Gupta rulers, the Bihar rulers, and then the Garhwal ruler Govinda Chandra from 1114 AD until 1154 AD.