Udaypur Wildlife Sanctuary (also spelled Udaipur) is a wildlife sanctuary located in West Champaran district of Bihar state, India.

The wildlife sanctuary is predominantly wetland, located on an oxbow lake in the floodplain of the Gandaki River.

It is home to a variety of water birds, both resident and migratory.

[1] It is in the Lower Gangetic Plains moist deciduous forests ecoregion.

The sanctuary is under the authority of the Deputy Director of the Champaran Forest Division, headquartered in Bettiah.