The present study reports for the first time on the helminth species occurring in the gastro-intestinal system of fat dormice (Glis glis) in Croatia. Out of 55 dormice, 63.7 % harboured helminths belonging to two species, the nematode Paraheligmonina gracilis (syn. Longistriata elpatievskii) (Heligmonellidae, Trichostrogyloidea) in the prevalence of 52.7 %, and the cestode Hymenolepis sulcata (Hymenolepididae, Cyclophyllidea) in the prevalence of 32.7 %. Concurrent infections of both parasites were found in 12 fat dormice, P. gracilis alone was detected in 17 hosts and H. sulcata alone in 6 samples. No influence of parasitic infestation on animal weight was observed. Glirid helminths do not represent zoonotic pathogens despite the fact that dormice occasionally inhabit cottages and village houses, and are used in human nutrition.