This study was conducted in order to assess the parasitological status in free-ranging birds in Greece. There were examined 135 birds belonging to 30 species and 14 families (Anatidae, Accipitridae, Falconidae, Phoenicopteridae, Laridae, Sternidae, Rallidae, Strigidae, Ardeidae, Caprimulgidae, Apodidae, Corvidae, Columbidae, Muscicapidae). At least two of the bird species examined are included in the “Red Data Book of Threatened Vertebrates of Greece” and are classified as endangered or rare. The birds were found in different parts of the country and were brought to the Clinic of Avian Medicine of the School of Veterinary Medicine either by the Greek Center of Hospitalization of Wild Animals or by individual volunteers. For each bird a record was kept, including the bird species, the area that it was found, the cause of death and other gross lesions. The most common cause of death was injury, followed by enteritis, starvation and parasitism. The digestive tracts of the birds were brought to the Laboratory of Parasitology and Parasitic Diseases, where the parasites were collected. Additionally, coprological examination was performed by three parasitological methods (zinc sulphate flotation, precipitation and Safranin-Methylen blue stain). The following parasites were found: Protozoa (Cryptosporidium spp., Entamoeba spp., Giardia spp., Blastocystis spp., Eimeria spp., Trichomonas spp.), Trematoda (Cotylurus cornutus, Notocotylus attenuatus, Cardiocephalus longicollis, Echinostoma revolutum, Neodiplostomum spathula, Ophiosoma spp., Bolbophorus confusus, Clinostomum complanatum, Ornithobilharzia spp.), Cestoda (Raillietina spp., Abortilepis spp.), Nematoda (Amidostomum anseris, Capillaria contorta, Capillaria obsignata, Trichostrongylus tenuis, Echinuria (Acuaria) uncinata, Acuaria (Dispharynx) spiralis, Contraceacum spp., Heterakis gallinarum, Ascaridia spp., Acuaria hamulosa, Tetrameres spp., Heterakis dispar) and Acanthocephala (Centrorynchus globocaudatum, Centrorynchus aluconis, Corynosoma strumosum). In one case, Syngamus trachea was found in the trachea. Some of these parasites are reported for the first time in Greece. Identification of parasites was carried out using criteria published in the international literature.