The Euctenizidae (formerly Cyrtaucheniidae subfamily Euctenizinae) are a family of mygalomorph spiders.

[citation needed] The name comes from the Greek prefix εὖ- (eu-), meaning "valuable" or "good", which had been thought that the family Ctenizidae possess these traits.

The family occurs almost exclusively in the United States and Mexico.

Common U.S. genera include Myrmekiaphila, Aptostichus and Promyrmekiaphila.

As of October 2020[update], the World Spider Catalog accepts the following genera:[2]