Nautan Assembly constituency is an assembly constituency in Paschim Champaran district in the Indian state of Bihar.

As per orders of Delimitation of Parliamentary and Assembly constituencies Order, 2008, 6.

Nautan Assembly constituency is composed of the following: Bairiya and Nautan community development blocks.

[1] Nautan Assembly constituency is part of 2.

[1] It was earlier part of Bettiah.