West Champaran (, Maġribī Čaṃpāraṇ Zilā) is an administrative district in the state of Bihar in India. It is a part of Tirhut Division. The district headquarters are located at Bettiah.
The district occupies an area of 5229 km² and has a population of 3,043,044 (as of 2001).
It is known for its porous border with Nepal, as well as the high levels of crime and smuggling that accompany this. It was the main transit point for Ganja and Weapons travelling between India and Nepal, however the new government in Bihar has led to a significant reduction in kidnapping and smuggling in the area.