The corsac fox (Vulpes corsac), also known as the steppe fox, is a medium sized Asiatic fox species found throughout the central steppes of Asia. It is sometimes referred to as the "sand fox", but this terminology is confusing because two other species, the Tibetan sand fox and Rüppell's fox are also sometimes known by this name. The corsac fox is threatened by hunting for the fur trade.

The corsac fox is a medium-sized fox, with a head and body length of 45 to 65 centimetres (18 to 26 in), and a tail 19 to 35 centimetres (7.5 to 14 in) long. Adults weigh from 1.6 to 3.2 kilograms (3.5 to 7.1 lb). It has grey to yellowish fur over much of the body, with paler underparts and pale markings on the mouth, chin, and throat. During the winter, the coat becomes much thicker and more silky in texture, and is straw-grey in colour, with a darker line running down the back.

For a fox, it has small teeth and a wide skull. It has hooked claws and can climb trees.^{[citation needed]} It is reported to have keen eyesight and hearing and an acute sense of smell. It has a number of scent glands, some of which produce pungent odours, although not as extreme as those found in some other Vulpes species. The glands are found in the anal region, above the base of the tail, and on the paws and cheeks.