| Dinichthys Temporal range: Late Devonian: Famennian,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Clade: | †Phlyctaenioidei |
| Suborder: | †Brachythoraci |
| Clade: | †Eubrachythoraci |
| Clade: | †Pachyosteomorphi |
| Clade: | †Aspinothoracidi |
| Genus: | †Dinichthys Newberry, 1868 |
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Dinichthys (from Greek: δεινός deinós, 'terrible' and Greek: ἰχθύς ichthys 'fish') is an extinct monospecific genus of large marine arthrodire placoderm from the Late Devonian (Famennian stage) measuring around 3 metres (9.8 ft) long.[1] Fossils were recovered from the Ohio Shale Formation along the Olentangy River in Delaware County, Ohio.
- ^ Bashford Dean (1895). Fishes, Living and Fossil: An Outline of Their Forms and Probable Relationships. Macmillan and Company. p. 130. Retrieved 28 August 2022.