This post presents the results on the occurrence of non-native plant species in riparian vegetation of Váh river (municipality of Šaľa). During the field survey within vegetation period of 2017, we identified sixteen non-native plant species. Ten of them belongs to invasive, four to naturalized and one to potentially invasive group of species. In terms of overall abundance in the area, the species Aster lanceolatus dominated. It covered large areas on the river bank and in surrounding riparian forests. Also species Negundo aceroides, Robinia pseudoacacia, Solidago gigantea and Ambrosia artemisiifolia colonized the largest areas. Especially the occurrence of A. artemisiifolia in such amount represents a potential risk for human health. Twelve from all the non-native species we recorded were directly from bank vegetation (up to 50 m from river bank).