The character of this work is faunistic and its main aim is to present the largest spectrum of mite species. As a result of acarologic examination on territory of the “Bory Tucholskie” National Park, 42 samples were collected, from which 77 mite species of Mesostigmata order were separated. The greatest numbers of species were represented by the families Ascidae (16 species), Laelapidae (13) and Parasitidae (10). The most plentiful species that occurred in the collected material were Trichouropoda rafalskii, T. ovalis, Veigaia nemorensis, Trachytes aegrota and Zercon triangularis, while in the greatest number of samples T. ovalis, V. nemorensis, Z. triangularis and T. aegrota were recorded.

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