古西伯利亚语言(Paleosiberian languages、Paleosiberian)，或古亚细亚语言(Paleoasian languages、Palaeo-Asiatic)，并不是一种语言，也不是一个正式的语系，而是语言学家用来指涉某些位于西伯利亚偏远地区的孤立语言和小语系语言的称谓，作为这些语言的总称。古西伯利亚语言的情况十分复杂，各语言之间的系属关系目前也不十分明确。因此，古西伯利亚语言基本上只是为了描述上的便利而创造出来的，并不意味这些语言之间有历史发展上的承传关系。

说古西伯利亚语言的人口总数约为23,000人。

Paleosiberian (Palaeosiberian, Paleo-Siberian) languages or Paleoasian languages (Palaeo-Asiatic) (from Greek palaios, "ancient") is a term of convenience used in linguistics to classify a disparate group of linguistic isolates as well as a few small families of languages spoken in parts both of northeastern Siberia and of the Russian Far East. They are not known to have any linguistic relationship to each other; their only common link is that they are held to have antedated the more dominant languages, particularly Tungusic and latterly Turkic languages, that have largely displaced them. Even more recently, Turkic (at least in Siberia) and especially Tungusic, have been displaced in their turn by Russian. It is possible that the Merkits spoke a Paleosiberian language.