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| Thyestes Temporal range: Ludlow
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Osteostraci |
| Order: | †Thyestiida |
| Family: | †Thyestiidae |
| Genus: | †Thyestes |
Thyestes is an extinct genus of osteostracan agnathan vertebrate of Europe whose fossils are found in Middle to Late Ludlow-aged marine strata of Late Silurian Europe. Individuals of Thyestes superficially resembled Cephalaspis, but were more closely related to Auchenaspis and Tremataspis.