Paeonian, sometimes spelled Paionian, is a poorly attested, extinct language spoken by the ancient Paeonians until late antiquity.
Paeonia was located to the north of Macedon, south of Dardania, west of Thrace, and east of the southernmost Illyrians.
Classical sources usually considered the Paeonians distinct from the rest of the Paleo-Balkan people, comprising their own ethnicity and language. It is considered a Paleo-Balkan language but this is only a geographical grouping, not a genealogical one. Modern linguists are uncertain as to the classification of Paeonian, due to the extreme scarcity of surviving materials in the language, with numerous hypotheses having been published:
Athenaeus seems to have connected the Paeonian language to the Mysian language, for which Strabo noted that it was, "in a way, a mixture of the Lydian and Phrygian languages".
Several Paeonian words are known from classical sources:
A number of anthroponyms (some known only from Paeonian coinage) are attested: (), (), (), (), (), (), etc. In addition several toponyms ( (), () and a few theonyms (), (), the Paeonian Dionysus, as well as the following: