沙狐（学名：Vulpes corsac；英文：Corsac Fox），亦称东沙狐，食肉目犬科狐属。春末夏初产子，每年一胎，通常每胎3～6只。2岁性成熟。寿命约6年。

主要分布于中国（**、青海、甘肃、宁夏、内蒙古、**）、蒙古、外贝加尔、阿富汗、尼泊尔等地区。

The corsac fox (Vulpes corsac), also known simply as a corsac, is a medium-sized fox found in steppes, semi-deserts and deserts in Central Asia, ranging into Mongolia and northeastern China. Since 2004, it has been classified as least concern by IUCN, as populations fluctuate significantly, and numbers can drop tenfold within a single year.