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| Diplacanthus Temporal range:
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| Fossil specimen of D. crassissimus (=D. striatus) | |
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| Life restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Acanthodii |
| Order: | †Diplacanthiformes |
| Family: | †Diplacanthidae |
| Genus: | †Diplacanthus Agassiz, 1843 |
| Species | |
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see text | |
Diplacanthus is an extinct genus of Mid to Late Devonian fish in the class Acanthodii, known as spiny sharks.