The main objective of this study was to determine the diversity, age and functional trophic structure of the freshwater snail and bivalve community in the Bednja River. Macrozoobenthos samples were collected during summer months of 2015 at 20 localities distributed along the Bednja River using a bentos net (kracer). Snail and bivalve species were separated from other groups in the laboratory and preserved in 75% alcohol. With the help of dichotomous keys, snails and bivalve moluscs were identified to the species level with the exception of the genus Pisidium. During the investigation, a total of 15 snail and five bivalve species were found. The most common snail species was Holandriana holandrii (C. Pfeiffer, 1828) and Theodoxus danubialis (C. Pfeiffer, 1828) while the most common bivalve was the genus Pisidium. Furthermore, an invasive bivalve species Dreissena polymorpha (Pallas, 1771) was also found. The analysis of the age structure showed that juvenile specimens were dominant over adult specimens. Conducted analyses of functional feeding groups of snails showed that grazers were present with the highest share, followed by detrivores, while all bivalve species are filterers. The results of the cluster analysis confirmed that molluscan communities in the Bednja River do not show a pronounced longitudinal gradient. Results presented in this thesis will contribute to a better knowledge of the freshwater malacofauna of the Bednja River.