[en] The faunistic and ecological study of the helminthfaunas of mammals in Azorean islands is considered. 103 rodents (Rattus rattus L., 1758 and Mus musculus L., 1758) 9 insectivores (Erinaceus europaeus L., 1758) and 19 lagomorphs (Oryctolagus cuniculus L., 1758) were analysed. The hosts been captured in several biotopes of thre islands (São Miguel, Terceira and Flores). 27 helminth species were detected (3 Digenea Trematoda, 5 Cestoda, 18 Nematoda and 1 Acantocephala). All hosts species show high prevalences and no significant differences were found between different islands. The helminthfaunas show typical features of a young island parasitofaunas.