Purnia, also known as Purnea, is a district in the state of Bihar, India. It is located in the northeastern part of the state, bordering the country of Nepal. Purnia is the administrative headquarters of the district.

The district of Purnia covers an area of approximately 3,228 square kilometers and is divided into sub-divisions and blocks for administrative purposes. It is known for its fertile agricultural land and is primarily an agrarian region. The main crops grown in the district include paddy, wheat, maize, jute, and sugarcane.