Onychocrinus
| Onychocrinus Temporal range:
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| Fossil of Onychocrinus species from Carboniferous of United States | |
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| Order: | †Taxocrinida
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| Family: | †Synerocrinidae
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| Genus: | †Onychocrinus Lyon and Casseday, 1860
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Onychocrinus is an extinct genus of feathered crinoids that lived during the Carboniferous period, approximately 353.8 to 318.1 million years ago. It belonged to the family Synerocrinidae.