Micaria is a genus of ground spiders of the family Gnaphosidae which is found in the Holarctic, Indomalayan, Australasian and Afrotropical zoogeographic regions. The genus was first described in 1851 by the Swedish zoologist Niklas Westring. The type species of the genus is Micaria fulgens. These spiders often go by the common name of ant spiders due to their appearance which mimics ants. They hunt their prey on the ground and are mainly nocturnal, retiring to a retreat woven from silk during the day.