Abstract: This study presents results of mass balance calculation for petroleum discharges produced by littoral countries mainly into the Persian Gulf in their endangered or polluted points. Recent budget for total and local point source petroleum discharges to marine environment of the region calculated according to the outputs of a model based on reported trend in global petroleum discharges rates in the past three decades. Agreement between calculated petroleum discharges and reported values indicates the accuracy of applied assumptions. Based on above description, it has been estimated that petroleum discharges in the Persian Gulf is about 120186 t year^-1 or 600930 barrels year^-1.