Nineteen species of parasites belonging to seven taxonomical groups were detected in nine species of fish (Gobio gobio (Linnaeus, 1758), Cobitis taenia Linnaeus, 1758, Squalius cephalus (Linnaeus, 1758), Rutilus rutilus (Linnaeus, 1758), Misgurnus fossilis (Linnaeus, 1758), Sabanejewia baltica Witkowski, 1994, Barbatula barbatula (Linnaeus, 1758), Esox lucius Linnaeus, 1758 and Perca fluviatilis Linnaeus, 1758) from two small rivers in Polissky Nature Reserve in the northern part of Ukraine. The highest species richness of parasites was registered for G. gobio (7 species). Four species of parasites were found in S. cephalus. Three parasite species were found in E. lucius. Two parasite species were detected in R. rutilus and P. fluviatilis. C. taenia, M. fossilis, and S. baltica harboured each one species of parasites. Gyrodactylus sp. from S. baltica was reported for the first time. All parasites represent new geographical finding for the north of Ukraine.