This work was conducted at a private vegetable farm in El-Taweila, near El-Mansoura City, Dakahlia Governorate, Egypt during the two successive summer seasons of 2020 and 2021. The study examined the effect of exogenous foliar treatments of trehalose (200, 300 and 400 ppm), hydrogen peroxide (20, 30 and 40 ppm) and salicylic acid (150, 200 and 250 ppm) on heat stress tolerance of common bean plants cv. Giza 6. The results showed that the highest concentrations of trehalose, hydrogen peroxide and salicylic acid ‎recorded the maximum values of plant height, leaves number per plant, fresh and dry weight ‎per plant, total chlorophyll, antioxidant activities (catalase and peroxidase), seed ‎yield and seed quality compared to the lowest ones and control. Overall, the obtained results indicate the potential of trehalose at 400 ppm for alleviating the effect of heat stress on common bean by improving vegetative growth, antioxidant activity and finally seed yield and quality compared to other treatments.