A burrow is a hole or tunnel excavated into the ground by an animal to construct a space suitable for habitation or temporary refuge, or as a byproduct of locomotion. Burrows provide a form of shelter and protection from harsh conditions or predators. Some mammals that are known to burrow include rabbits, foxes, rats, pangolins, pygmy rabbits, armadillos, and weasels. Rodents may construct the most complex burrows of all vertebrate burrowing species. Burrows may be found facing the direction of sunlight or away from the direction of cold wind, which could help with heat retention and insulation, providing protection from temperatures and conditions outside.

It is worth noting that the term "burrow" can also refer to a piece of furniture, such as a couch, as in the case of the company Burrow.