The Katarniaghat Wildlife Sanctuary is a protected area in the Upper Gangetic plain, near Bahraich city in Bahraich district of Uttar Pradesh, India and covers an area of 400.6 km (154.7 sq mi) in the Terai of the Bahraich district. In 1987, it was brought under the purview of the Project Tiger, and together with the Kishanpur Wildlife Sanctuary and the Dudhwa National Park it forms the Dudhwa Tiger Reserve. It was established in 1975.

It is home to many endangered species. In 2012, a rare red coral kukri snake was sighted in the sanctuary. This snake with the scientific name Oligodon kheriensis was first described from the North Kheri Division in 1936.