A faunistic and conservation-oriented analysis of the Scarabaeoidea beetles from the Hidalgo State, México is presented. Seven families with 95 genera and 276 species are recorded, of which five genera and six species are considered introduced. Fifteen species are cited for the first time for this state and 21 species are considered to be erroneously or doubtfully recorded for Hidalgo. Thus, Hidalgo is the fifth Mexican state with the highest number of Scarabaeoidea species. On the basis of estimates of species numbers of several biological groups, it is extrapolated that at least 100 species are missing to record from this state. According to the geographical distribution of the species, six groups are proposed (with the exception of introduced species): endemic from Hidalgo (13 spp.), endemic from México (104 spp.), North American (37 spp.), Central American (55 spp.), Latin American (32 spp.), and American (29 spp.).
