Proto-Indo-European may refer to:
- Proto-Indo-European languageProto-Indo-European languageThe Proto-Indo-European language is the reconstructed common ancestor of the Indo-European languages, spoken by the Proto-Indo-Europeans...
, the hypothetical common ancestor of the Indo-European languages.
- Proto-Indo-EuropeansProto-Indo-EuropeansThe Proto-Indo-Europeans were the speakers of the Proto-Indo-European language , a reconstructed prehistoric language of Eurasia.Knowledge of them comes chiefly from the linguistic reconstruction, along with material evidence from archaeology and archaeogenetics...
, the hypothetical speakers of the reconstructed Proto-Indo-European language.