One hundred three viviparous lizards from various localities in Poland have been examined yielding 7 species of parasites: 2 adult trematodes, 2 meso- and metacercariae, 2 nematodes and 1 tick. Only two species of trematodes (Plagiorchis mentulatus and Metaplagiorchis molini) are specific parasites of lizards. Other are ubiquitous parasites of various amphibians and reptiles, except the nematode Mermis nigrescens - a typical parasite of insects, found occasionally in the stomach of lizards. All adult parasites were found in the alimentary tract, larval forms were encysted in the wall of the alimentary tract, serous membranes and parenchymatous organs, and ticks on the body surface. Some differences in geographical distribution of parasites have been observed, as well as differences in infection of lizards of various sex and size. The results are interpreted on the basis of the host’s behaviour.
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