The study was aimed at evaluating the extent of gastrointestinal and pulmonary helminth infections in the fallow deer in North- West Poland. Infection prevalence and intensity as well as the species composition of helminth fauna were determined. During about 2-year period, since March 2000 until February 2002, a total number of 52 animals and 98 faecal samples were examined. The fallow deer were shot during routine culls in 9 forest districts. We have found 12 gastrointestinal and 2 lung nematode species in fallow deer in NW Poland. The most common gastrointestinal species were Oesophagostomum venulosum, Spiculopteragia boehmi, Haemonchus contortus and Nematodirus spp. Other species were determined in a lower intensity. Two lung nematode species Elaphostrongylus cervi and Varestrongylus sagittatus were found, with their prevalence 59.6% and 46.1%, respectively.