Agrilus is a genus of jewel beetles, notable for having the largest number of species (about 3000) of any single genus in the animal kingdom.

[3] Species of the genus have a cosmopolitan distribution on all continents except Antarctica,[4] and feed on a wide variety of flowering plant hosts.

[5] The best known species is the emerald ash borer (Agrilus planipennis), a serious pest of ash trees, with other notable species including Agrilus biguttatus and Agrilus auroguttatus, which are pests of oak trees.

Four fossil taxa have been described:[6]