Palaeocarassius is an extinct genus of Miocene-aged cyprinid fish closely related to the crucian carps of Carassius.

Most fossils are of otoliths, teeth, fin spines, and scales found in Miocene-aged lacustrine strata throughout Europe, though, two species, P. basalticus[1] and P. priscus (syn.

Cyprinus priscus), are also known from whole body fossils, representing stout-bodied, large-headed animals that bear strong resemblances to the living crucian carps.

The holotype of the type species, P. mydlovariensis, is a disarticulated head.

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