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¹ Tekirdağ Viticulture Research Institude, Department of Breeding and Genetic Resources, Tekirdağ, Türkiye DOI : 10.52001/vis.2025.29.53.65 Viewed : 96 - Downloaded : 48 One of the most important characteristics in grapevine breeding studies is berry size. In table grape evaluation, consumers prefer grape varieties with large berries. For growers, grapes with large berries can be sold commercially at higher prices. Although grapevine breeding is a very active field of study, no molecular markers can be integrated into grapevine breeding. Therefore, many breeders want to understand the segregations of the traits they will work on in the varieties they will use as parents. This study evaluated grape varieties with large berries in the Turkiye Grapevine Field Gene Bank, which contains 1459 grape varieties in Tekirdağ Viticulture Research Institute. As stated in many publications, the evaluations used the positive correlation between berry weight and seed. They were designed to identify varieties that can reach the highest berry weight with the lowest seed presence. As a result of the evaluations, varieties with low seed numbers and seed weight values that can produce relatively large berries were identified in the Turkiye Grapevine Field Gene Bank. Local varieties such as Antep Şamı, İt Karası, Gadöv, Beyaz Çavuş and Akhisar Razakısı have emerged as promising candidates and it is recommended that these varieties be used as parents in breeding studies to develop new large-grape varieties. Keywords : Table Grape, Berry Size, Grape Seed, Breeding