Gnathodus is an extinct conodont genus in the family Idiognathodontidae.

The Tournaisian, the oldest age of the Mississippian (also known as Lower Carboniferous), contains eight conodont biozones, 3 of which are defined by Gnathodus species: The Visean, the second age of the Mississippian, contains four conodont biozones, two of which are defined by Gnathodus species: The Serpukhovian, the third or youngest age of the Mississippian, includes four conodont biozones, two of which are defined by Gnathodus species:

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