The aim of this study was to identify the bird species of Belgrad Forest in Istanbul, Turkey. The 5.441,71 ha study area was divided in 100 grid squares. Point counts and line transects were conducted in the forest between June 2001 and May 2003. As a result of the studies 146 species from 41 families of 17 orders were recorded. The regional status of 146 bird species are 30 resident, 5 resident and passage migrant, 4 resident and winter visitor, 5 summer migrant, 18 summer migrant and passage migrant, 57 passage migrant, 12 passage migrant and winter visitor, 11 winter visitor and 4 vagrant. Among them 51 species nested in the study area. Keywords: Istanbul-Belgrad Forest, bird species, abundance.