Willwerathia
| Willwerathia Temporal range:  | |
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| Reconstruction of Willwerathia laticeps | |
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| Genus: | †Willwerathia Størmer, 1969 | 
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Willwerathia is a genus of Devonian arthropod. It is sometimes classified as synziphosurine, a paraphyletic group of horseshoe crab-like fossil chelicerate arthropods, while some studies compare its morphology to an artiopod. Willwerathia known only by one species, Willwerathia laticeps, discovered in deposits of the Devonian period from the Klerf Formation, in the Rhenish Slate Mountains of Germany.