Staphylinid beetles were collected from May to December 2007 using several different sampling methods at three sites in Los Mármoles National Park, Hidalgo, Mexico. Two sampling sites were in pine—oak forest and one was in oak forest. In addition, records were included from less structured occasional collecting at other sites in the park. A total of 2,680 specimens belonging to 111 species, representing 91.7% of the 121 species currently known in Hidalgo state, were collected. The highest number of species and specimens were recorded at Las Trancas (Zimapán), followed by Minas Viejas and La Encarnación. These were the three sites where systematic collections were made, using a wide variety of methods. The highest number of staphylinid species was recorded in sifted leaf litter, followed by dung traps and carrion traps. The present contribution can help to identify the taxa inhabiting this protected natural area and aid in understanding the importance of continuing to conserve them.