Kogaionon is a mammal genus from the Upper Cretaceous of Romania.

It lived in Transylvania the same time as some of the last non-avian dinosaurs and was a member of the extinct order of Multituberculata.

It was named after Kogaionon, the holy mountain of the ancient Dacians.

This genus is known from one species, Kogaionon ungureanui, the fossil remains of which have been found in the Maastrichtian (Upper Cretaceous) Sinpetru Beds of the Hateg Formation in Romania.

The species name is in appreciation of the geologist Costin Ungureanu, who found the fossil.