Perryus is a genus of phacopid trilobites that lived in what are now Canada, Greenland, and Siberia from the early Silurian to the middle Silurian from 438 to 430 mya, existing for approximately 8 million years.

[1] Perryus was named by Gass & Mikulic in 1982.

[2] Jell and Adrain list it as a currently valid genus name within the Phacopida, specifically within the Encrinuridae.

[3] Perryus bartletti Edgecombe & Chatterton, 1992; Perryus globosus (Maksimova, 1962); Perryus mikulici Hughes & Thomas, 2014; Perryus severnensis Gass & Mikulic, 1982 (type species); Perryus palasso (Lane, 1988)