Two field experiments were conducted during the two growing seasons, 1997 and 1998 at the Experimental Station of the National Research Centre at Shalakan, Kalubia, Egypt, to study the effect of different concentrations (0,20,40 and 80 mg/l) of stigmasterol on the growth  yield, and its components as well as chemical composition of maize grain.                 Vegetative growth of maize plants (plant height, leaf area/plant, leaf area index (LAI), total plant dry weight and net assimilation rate (NAR) were significantly increased at all applied concentrations of stigmasterol which were given twice as foliar spray when the plants were at elongation and tassel appearance stages. However, insignificant effect was observed on crop growth rate (CGR). Yield and its components (ear length, ear diameter, number of grain rows/ ear, weight of 100- grain, shelling percentage,  and grain yield/plant were significantly increased for plants which were twice sprayed by the stigmasterol, especially at 80 mg/l..                 Total sugars, crude protein and oil percentage of maize grains were increased as the number of sprays and concentrations of stigmasterol increased. Increasing the number of sprays or concentrations of stigmasterol were significantly effective for increasing vegetative growth, yield and its components as well as the  chemical composition of maize plants.                 Highly significant and positive simple correlation was obtained between concentrations of stigmasterol, growth characters, yield and its components of maize plants.                 Multiple correlation between the number of sprays, concentrations of stigmasterol, growth characters, and yield and its components were highly significant.