This study documents the diversity of intestinal parasites in the eastern broad-toothed field mouse (Apodemus mystacinus) along the altitudinal gradient of Ibrahim River in Mount Lebanon during the spring and autumn of 2017. A total of 190 A. mystacinus were trapped in seventeen sites (6 riparian, 11 non-riparian) and examined for intestinal parasites. Eight intestinal parasites were identified including Heligmosomoides polygyrus, Trichuris muris, Syphacia frederici, Protospirura muris, and Aspiculuris tetraptera (nematodes), Hymenolepis diminuta (cestode), Brachylaima spp. (trematode), and Eimeria alorani (coccidian). Most of the trapped mice (85%) were infected with intestinal parasites and 38.84% showed concurrent infection with at least two parasitic species. The season had a significant effect on mice infection with Syphacia frederici, and mice are most likely to have infection with this nematode in spring season. The vegetation zone had a significant overall impact on mice infection with the nematodes Heligmosomoides polygyrus and Trichuris muris while gender did not influence significantly mouse infection with intestinal parasites. This is the first study that has been carried out to identify the intestinal parasite community in A. mystacinus of Ibrahim River region. The findings pave the way for future studies on intestinal parasites in rodents and the environmental variations affecting their dynamics.