Udaipur wildlife Sanctuary is a wildlife sanctuary located in West Champaran district of Bihar state, India. It was established in 1978, and covers an area of 8.74 square km. The wildlife sanctuary is predominantly wetland, located on an oxbow lake, popularly known as Udaipur Jheel, was designated as a Ramsar site (Site number 2577) on May 13, 2025, covering 319 hectares in the floodplain of the Gandak River. It is an important biodiversity hotspot, featuring swamp forest, dry riverine forest khair-sissoo forest (Acacia catechu-Dalbergia sissoo) and supporting over 35 migratory bird species and is habitat of Spotted Deer, Barking Deer, Wild Boar, Blue Bull, Civet, Jungle cat, Porcupine etc. The cultural dimensions of these sites are intricately interwoven with regional history. The safeguarding of these sites, with active involvement from concerned communities and stakeholders, may aid in their effective and long-term management.