Graeco-Aryan refers to a hypothesis that the Proto-Greek and the Proto-Indo-Iranian languages share a common history separate from the remaining Indo-European languages. Graeco-Aryan has little support among linguists, since both geographical and temporal distribution of Greek and Indo-Iranian fit well with the Kurgan hypothesis, associating late PIE with the 4th millennium BC Yamna culture, consistent with a roughly mid-3rd millennium BC date for both Proto-Greek and Proto-Indo-Iranian.

Other hypothetical language groups

• Indo-Hittite
• Graeco-Armenian
• Italo-Celtic
• Balto-Slavic

Indo-European languages | Proto-languages