The Pre-Greek substrate (or Pre-Greek substratum) consists of the unknown language or languages spoken in prehistoric Greece before the settlement of Proto-Greek speakers in the area. It is possible that Greek took over some thousand words and proper names from such a language (or languages), because some of its vocabulary cannot be satisfactorily explained as deriving from the Proto-Greek language.

The Pre-Greek substrate (or Pre-Greek substratum) consists of the unknown language or languages spoken in prehistoric Greece before the settlement of Proto-Greek speakers in the area. It is possible that Greek took over some thousand words and proper names from such a language (or languages), because some of its vocabulary cannot be satisfactorily explained as deriving from the Proto-Greek language.