The Balto-Slavic language group traditionally comprises the Baltic and Slavic languages, belonging to the Indo-European family of languages. Baltic and Slavic languages share several linguistic traits not found in any other Indo-European branch, which points to a period of common development. Most Indo-Europeanists classify Baltic and Slavic languages into a single branch, even though some details of the nature of their relationship remain in dispute in some circles, usually due to political controversies. Some linguists, however, have recently suggested that Balto-Slavic should be split into three equidistant nodes: Eastern Baltic, Western Baltic and Slavic.

The Balto-Slavic language group traditionally comprises the Baltic and Slavic languages, belonging to the Indo-European family of languages. Baltic and Slavic languages share several linguistic traits not found in any other Indo-European branch, which points to a period of common development. Most Indo-Europeanists classify Baltic and Slavic languages into a single branch, even though some details of the nature of their relationship remain in dispute in some circles, usually due to political controversies. Some linguists, however, have recently suggested that Balto-Slavic should be split into three equidistant nodes: Eastern Baltic, Western Baltic and Slavic.