We present an inventory, followed by a consolidated list, for the avifauna of Estação Ecológica da Serra das Araras (EESA), state of Mato Grosso, Brazil. In our expeditions, we identified 287 species, 82% of them documented. Of these, 28 species are new records for EESA. Six are threatened, such as Lophornis gouldii (Lesson, 1832). Other noteworthy records include the first documentation of Oxyruncus cristatus Swainson, 1821, for Mato Grosso. The consolidated list includes 458 species, of which 255 were assigned to the primary list and 203 to the secondary list. The significant number of species compiled herein places EESA among the most species-rich protected areas of Brazil, especially in regard to areas not predominantly covered by forest. In terms of species composition, this is a community typical of an ecotone environment, featuring many species characteristic of the Cerrado and the Amazon and some of the Pantanal wetland.