This study was carried out to determine the fruit characteristics of some standard walnut cultivars grown in Bozdoğan district of Aydın during the years of 2003 and 2004. Fruits samples have been collected from 10-12 year-old trees in established walnut gardens in the maturation period. Traits like the total weights of the fruits, kernel weights, kernel ratios, shell thicknesses, height and width of the fruits, sticking to the shell, shell color and roughness, kernel fullness, decayed kernel, all outbreak and harvest dates have been determined. In standard fruit samples of the fi rst year, fruit weights ranged from 18.87g (Yavuz) to 10.44 (Kaman); kernel weights were 8,68 (Yavuz) – 5,53 (Yalova 3); kernel ratio varied between % 63,57 (Şebin) – 45,11 (Şen 1). In the data of the second year, fruit weights were 18,21g (Yavuz) - 11,25 g (Bilecik, Şebin); kernel weights were found between 11,50g (Yavuz) and 7,01 g (Kaman); kernel ratio were between the values of % 67,56 (Bilecik) and 51,11 (Yalova1). Shell thickness ranged from 1.76mm (Yalova1) to 1.12 (Kaman 1).