Objective: The aim of present study was to retrospectively determine the prevalence of intestinal parasites in patients, who werereferred to Parasitology Laboratory in Van Yüzüncü Yıl University, Faculty of Medicine during an 11-year period.Methods: Stool samples of 69633 individuals admitted to the outpatient clinics in the hospital were initially evaluated withnative-Lugol, and then by flotation, sedimentation, trichrome staining, modified acid-fast staining and ELISA methods.Results: Twenty-four parasite species were identified in parasite-positive patients. At least one or more parasite species werefound in 34.1% of all patients. The most commonly observed parasite was Blastocystis hominis (26.5%). Among pathogen parasites,Giardia intestinalis (G. intestinalis) was detected in 9.3%, Ascaris lumbricoides (A. lumbricoides) was detected in 2.5%, Entamoebahistolytica/Entamoeba dispar in 0.8%, Cystoisospora belli in 0.004%, Fasciola hepatica in 0.04%, Dicrocoelium dendriticum in 0.001%,Strongyloides stercoralis in 0.001% and hookworm in 0.001% of the patients.Conclusion: It was determined that, pathogen parasites such as G. intestinalis and A. lumbricoides were still observed at high ratesin Van province, especially in children, and the problem of parasitosis is still continuing, although the prevalence of parasites hasdeclined when compared to the previous years.