Proetus is a genus of proetid trilobite found in Silurian-aged marine strata of Europe and Devonian-aged strata of Gondwana.
The generic name commemorates Proetus (), a mythical king of Argos and Tiryns, son of King Abas of Argo.
Proetus is the type genus of the order Proetida, and of the family Proetidae. The genus became a wastebasket taxon that held numerous species of similar looking trilobites from the Ordovician to Carboniferous periods. Most of these species have been split off into other genera at various times.
The following list is incomplete: