The diversity of arthropods is studied, at family and species level, on a pig carcass during a warm season in an open field in Badghan-Mount Lebanon. Ten orders of arthropods were found associated to the carcass. A total of 1168 specimens of adults Diptera and Coleoptera were collected. Among Diptera, the predator Chrysomya albiceps was dominant on the carcass during the active decay stage and Musca spp. were necrophagous. Within Coleoptera, Creophilus maxillosus (Linnaeus, 1758), Philonthus concinnus (Gravenhorst, 1802), Aleochara lata Gravenhorst, 1802, and Saprinus sp. were the predator taxa. Dermestes frischii Kugelann, 1792 and Necrobia rufipes (De Geer, 1775) were more present during the advanced decay, together with anthicids. In addition to a list of species visiting the carcass, we carried out a multivariate analysis of principal components to explore the relationships between the pattern of presences of 16 insect families and the four decomposition stages during the first 30 days of the carcass decomposition. The groupings of insects during the four decomposition stages show significant dissimilarities, suggesting that the different stages are characterized by different insect associations, as reported in many other previous studies.