Patterns of distribution and extinction of biodiversity underscore the urgent need to protect habitats. The state of Morelos has more than 400 species of birds, 35.6% of the total national diversity. The Cerro de la Tortuga State Park, protected natural area of the state of Morelos, is one of the last remnants of vegetation in the center-south of the state. Until now, the avifauna present in this region was not known, for which reason, this study presents a list and analysis of avifauna diversity present in this protected natural area. Monthly samplings were carried out, from March to October 2017, through counting points, mist nets and intensive searches, trying to register the largest number of species present. A total of 125 bird species were recorded, grouped into different trophic guilds, residence categories, endemism and threat. Of the 125 species of birds present in the protected natural area, 11 are under some category of threat and 22 with some category of endemism. The Cerro de la Tortuga, despite being an area of little territorial extension, represents an area of importance for the conservation of the Mexican avifauna in the state of Morelos.