Over 86 different types of viruses that parasitize within the grapevine have been discovered worldwide, of which only a small number constitute economically significant viruses. Representatives of important grapevine viral diseases, depending on the literature and the region of cultivation, are mainly included in eight viruses that belong to three groups: infectious degeneration (Arabis mosaic virus - ArMV, Grapevine fanleaf virus - GFLV), grapevine leafroll (Grapevine leafroll-associated virus -1, 2 and 3 - GLRaV-1, 2 i 3) and rugose wood (A-grapevine virus - GVA and B-grapevine virus - GVB). In addition to the aforementioned groups, the Grapevine fleck virus (GFkV) is usually concluded. This study aimed to determine the presence of economically important grapevine viruses within vineyards in the vicinity of Poreč. Samples were collected from 7 different sites and were subjected to the enzyme-linked immunosorbent assay (ELISA). The presence of all economically important grapevine viruses was confirmed. The most common among them was GLRaV-3 (50,1%), followed by: GVA (18,3%), GFkV (7,8%), GLRaV-1 (4,3%), GFLV (2,8%), GLRaV-2 (1,5%) and in the last place is the presence of ArMV (0,3%) The presence of mixed infections was also confirmed, with GLRaV-3 + GVA - 16,6 % as most common combination. On the other hand, other mixed infections were confirmed, but their percantage did not exceed more than 6 %.