The ISSR (Inter-Simple Sequence Repeats) data were used to assess genetic relationship among 16 table grape varieties (Vitis ssp.) grown in Turkey. Fourteen primers selected from 50 primers generated a total of 110 clear DNA fragments in which 88 were polymorphic (80.5%). The mean similarity index of all pair-wises was 0.637, and ranged from 0.422 ('Isabella' and 'Konigin der Weingarten') to 0.902 ('Alphonse Lavallee' and 'A. L. Type Royal'). Consequently, considering morphological and cultural characteristics including the high similarity value, 'Alphonse Lavallee' and 'A. L. Type Royal' could be theoretically identical. Grape cultivars analysed were divided on the clustering dendrogram (by UPGMA) according to genetic composition of related species. Our data deduced that distant genetic similarity was found between groups of different cultivars of species. 'Isabella' (V. labrusca) and 'Kyoho' (V. vinifera x V. labrusca, 4x) had a far similarity to V vinifera grapes.