灰狐（学名：Urocyon cinereoargenteus），是狐狸的一种，英文名为Gray fox。

为美洲的特产。分布范围从北美南部到中美和南美北部。

The gray fox (Urocyon cinereoargenteus) is a carnivorous mammal of the family Canidae ranging throughout most of the southern half of North America from southern Canada to the northern part of South America (Venezuela and Colombia). No other canid's natural range spans both North and South America and it is the only American canid that can climb trees. This species and its only congener, the diminutive Channel Island fox (Urocyon littoralis), are the only living members of the genus Urocyon, which is considered to be the most basal of the living canids. Though it was once the most common fox in the eastern United States, and still is found there, human advancement and deforestation allowed the red fox to become more dominant. The Pacific States still have the gray fox as a dominant. Its specific epithet cinereoargenteus means 'ashen silver'.