Purnia District is one of the thirty-eight districts of the Indian state of Bihar. The city of Purnia is the administrative headquarters of this district. The city of Purnia has continued its tradition of hoisting the national flag at 12:07 am on every Independence Day since 1947. Purnia district is a part of Purnia Division. The district extends northwards from the Ganges river.

Purnia is the fourth largest city of Bihar and is emerging as the largest economic hub in North Bihar. It serves as the administrative headquarters of both Purnia district and Purnia division in the Indian state of Bihar. It is well known for its favourable climate like Darjeeling and has an abundance of resources for human settlements and economic activities.