Leon of Paionia
[Image:PaeoniaPaioniaMap.png|thumb|right|250px|Paeonia,tribes and Environs]
Leon of Paionia was an ancient Paeonian king, the father of Dropion.
In 279, when the Gauls defeated Ptolemy Ceraunus and got as far as Delphi, it is certain that Paeonia was overrun and held for a time by their chieftain Brennus, but in the wake of the Celtic invasion, Leon reestablished the Paeonian kingdom.