The Ranebennur wildlife sanctuary is located in Ranebennur Taluk of Haveri District, Karnataka. The sanctuary is declared on 17-6-1974 as per Government of Karnataka Notification No.AFD-58-PWL-74 with an area of 119 Sq.km (30,464 acres). This sanctuary mainly concerned with the conservation of Black bucks and Great Indian Bustard. Due to habitat loss GIB are not sighting since from 1998 and the sanctuary inhabits a wide variety of fauna and flora. The entire survey was comprehensively carried out by walking along the fixed paths for documentation of avifauna. Depending on the movement and occurrence, birds were classified as resident, resident migratory, local migratory, winter migratory and summer migratory depending on the frequency of sightings, birds were classified as: common, uncommon, rare and fairly common. The present study aims to estimate the avifaunal diversity in Hullathi section 0f Ranebennur wildlife sanctuary. The study revealed the occurrence of 104 species of birds in Hullathi section respectively. Among them Black-headed Ibis (Threskiornis melanocephalus), were listed in the near threatened category (IUCN, 2012). The result also showed that the agriculture land, wetland area and surrounding vegetation are favorable environmental conditions suitable for the migratory, resident as well as the threatened species of birds. These are protected under the provisions of schedule IV of Indian Wildlife Protection Act, 1972. The spotting of these threatened bird species highlights the importance of study area as an important feeding, staging and wintering ground for birds. published by the Journal of Biodiversity and Environmental Sciences (JBES)