Drydenius is an extinct genus of marine ray-finned fish known from the early-mid Carboniferous of the United Kingdom. It is one of a number of early fish genera long placed in the likely paraphyletic order Palaeonisciformes, potentially within the family Gonatodidae.
It contains the following species:
D. insignis Traquair, 1890 - Serpukhovian of Scotland (Limestone Coal Formation) D. molyneuxi (Traquair, 1888) (type species) - Late Bashkirian (Westphalian) of England and Wales (Pennine Coal Measures) (=Gonatodus molyneuxi Traquair, 1888)
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