This is a list of the bird species recorded in Mongolia. The avifauna of Mongolia includes a total of 427 species, of which 4 are rare or accidental. 1 species listed is extirpated in Mongolia and is not included in the species count. This list's taxonomic treatment and nomenclature follow the conventions of Clements's 5th edition. The family accounts at the beginning of each heading reflects this taxonomy, as do the species counts found in each family account. Accidental species are included in the total species counts for Mongolia.

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