Arilus, or wheel bugs due to the semicircular crest on the pronotum,[1][2][3] is a genus of true bugs in the family Reduviidae, subfamily Harpactorinae and tribe Harpactorini.

Most species are found in the Americas.

[4] Arilus is a generalist predator of insects.

[2] See North American wheel bug for details about a representative species.

Five extant species plus one fossil species are included within this genus:[5] Three additional species originally described in the genus are currently incertae sedis.