The study was conducted on twelve-year-old Washington navel orange (Citrus Sinensis L. Osbeck) trees at a private orchard in Badaway, Al-Dakahlia governorate, Egypt, between 2019 and 2020. The objective of study was evaluated the changes in quality parameters and mineral composition in the healthy and creased fruit, and the effects of calcium chloride (CaCl₂) and moringa leaf extract (MLE) sprays on the creasing, yield and fruit quality of Washington navel orange. The experiment was laid out in randomized complete block design with three replications and five treatments: T1=Control (distilled water only), T2= CaCl₂ at 1%, T3= CaCl₂ at 2%, T4= MLE at 2%, T5= MLE at 3%. Spraying treatments were applied three times in both seasons: during the full bloom stage, the fruit setting stage, and two weeks after the fruit setting stage. The results showed a strong correlation between the quality parameters, the nutrient composition, and the fruit creasing incidence. Foliar application of moringa leaf extract reduced the incidence of fruit creasing while increasing fruit yield, fruit weight, fruit firmness, fruit peel thickness, TSS, and vitamin C in 'Washington navel' orange. Hence, moringa leaf extracts at 3% is adapted to decrease the incidence of creasing and improve the yield components and fruit quality of ‘Washington navel' orange under experimental conditions.