Eoeugnathus (Greek for "dawn true-jaw") is an extinct genus of prehistoric marine ray-finned fish belonging to the Halecomorphi.

[1] Eoeugnathus existed during the Middle Triassic in what is now Europe.

[2][3] It contains two species:[4][5] It was initially placed in the Caturidae and then the Panxianichthyiformes,[6] but more recent studies have placed it in the new ionoscopiform family Subortichthyidae.

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