Phaeoura quernaria, the Oak Beauty, is a moth of the Geometridae family. It is found in eastern North America, occurring as far west as east-central Alberta. The habitat consists of aspen-cherry shrubland. The wingspan is 37–56 mm. The wings are powdery light to dark olive brown, with a white patch at the forewing apex. Adults are on wing from February to October in the southern part of the range, where two generations per year occur.