Solubilities of nitrogen and oxygen were determined on the 1,2-ethanediol + water solution over the full range of composition by a static method. The gas solubility was measured at 298.15 K and 101.33 kPa. Both the excess Ostwald coefficient and the excess volume of the mixed solvent showed similar dependencies on the volume fraction. The observed values of oxygen and nitrogen in 1,2-ethanediol + water were expressed by the Ostwald coefficient. From the result of the solubility of argon by Ben-Naim and our observed solubilities of nitrogen and oxygen, the order of gas solubility was argon > oxygen > nitrogen in the full range of comPositiOn. Furthermore, the excess Ostwald coefficients on the basis of the volume fraction which express the nonideality of gas solubility in nonideal solutions were defined, and excess Ostwald coefficients of these three solute gam in 1,2-ethanediol + water showed the same curve against the volume fraction of 1,2-ethanediol. This result means that the kind of solute gas had no effect on the excess Ostwald coefficient defined in this work. This property was identical with that for monoalcohol aqueous solutions.