In this paper the results of coprologi-cal investigation in roe deer (Capreolus capreolus) living in Kampinoski National Park were presented. The level of extensity and intensity of gastro-intestinal nematodes and coccidian was estimated. The seasonal changes in level of invasion of these parasites was also take under consideration. The extensity of gastro-intestinal nematodes fluctuated from 10 to 100% with average intensity from 5 to 535 eggs/1 g of faeces. The extensity of coccidia fluctuated from 20 to 70% with average intensity from 25 to 160 oocysts/1 g of faeces. In both groups the higher level of invasions were noticed during spring and autumn.