ABSTRACT. – The presence of anthropogenic debris on coastal dunes is a well-recognized problem affecting terrestrial and marine ecosystems. Among the different types of debris, bottles represent a potential threat for macro-invertebrate populations of sandy coastal dunes. We carried out a field work studying the trap effect of discarded plastic and glass bottles deposited as debris (n = 174) in a sandy costal dune ecosystem in central Italy. Totally, 1403 individuals belonging to seven different taxa were found trapped in 62 discarded bottles. The performed analyses took into account the trapping effect of discarded bottles, distinguishing material type and target species, analyzing the abundance of individuals and frequency of trapping events. We didn’t find any difference respect to material type (plastic or glass) in terms of trapping effect. The studied threat affects mainly three important taxa of terrestrial dune invertebrates (Tentiria sp., Pimelia bipunctata, Theba pisana), although with different abundance of trapped individuals and frequency of trapping events.