The present study was conducted during two summer seasons 2017 and 2018 at the farm of El-Nubaria Agricultural Research Station, Ministry of Agriculture and land Reclamation to evaluate the responses of Algae extract foliar application on yield and quality traits of soybean (Glycine max L.) grown on calcareous soil conditions under irrigation water regime. Experimental design was a spilt plot design in a complete randomized blocks arrangement with three replications used to conduct all trials, four treatments of algae extractions under two irrigation treatments 75% and 100% of the ETc water stress treatments. Algae extracts in form of foliar application treatments (control, Algae extracts 1 = 1ml/l, Algae extracts 2 = 2ml/l and Algae extracts 4 = 4ml/l). Foliar application of Algae extracts liquid fertilizers are useful for achieving higher agricultural production, because act as plant growth stimulants is improved due to plant growth, protein, carbohydrate production and chlorophyll production. These beneficial effects are most noticeable when the plant is under stress. Algae extracts increased growth, grain yield and oil % of soybean under water stress (75% ETc water of irrigation treatment). These results suggest that foliar application of Algae extracts at the rate of 4 ml/l under water stress is effective strategy to improve soybean productivity under stress. Drought tolerance efficiency % was the highest values at application of 4 ml/l algae foliar spray treatment. The Water Utilization efficiency WUE increased with increasing water stress, means that the algae foliar spray application lead to an increase in plant efficiency to produce higher yield with lower water.