Agapetus is a genus of little black caddisflies of the family Glossosomatidae.

[1][2][3][4] Larvae of Agapetus could be confused with Protoptila (another Glossosomatidae), but are readily distinguished by the presence of 2 mesonotal sclerites instead of 3.

There have been few larval-adult associations of the Agapetus spp.

(7 of 30), so in areas with multiple species, adults or mature pupae are needed for species level identification.

The saddle-type rock cases for larval Agapetus usually have larger rocks along the edge of the case.