In this study, the effects of gibberellic acid (GA(3)) and brassinosteroid (BRs) applications on the yield and berry quality of Sultani grapes were determined during the 2017-2018 period. 28-homobrassinolide (Hbl) solutions with concentrations 4 ppm (Hbl-4) and 8 ppm (Hbl-8) were spray applied at veraison. Three GA(3) concentrations were implemented by spraying method. The applications times were as follows; Application 1: 10 ppm, clusters 5-10 cm in length at pre-bloom stage (first week of May), Application 2: 15 ppm at 45-50% flowering (mid-June), and Application 3: 20 ppm with 3-5 mm berry diameter stage. GA(3) and BRs on yield components, some quality characteristics relating to clusters and berries (weight, breadth and length, etc.), color of bunches, total phenol content and antioxidant activity were investigated. Results showed that the effects differed, and they were not consistent on all the variables. Effects of the HBl treatments on yield were not as high as GA(3) but there were some positive improvements. Hbl was found to be influential on increasing cluster breadth. Berries were harder with the hormone applications. Quality characteristics were more influenced by the seasons rather than the hormones. Color and total anthocyanin contents were better with the hormones. Fructose content indicated a significant increase with the Hbl-4 application. 28-homobrassinolide might carry some potentially useful effects on improving yield, not to the extent of GA(3), and also on color along with increasing sweetness during the production of 'Sultani' grapes.