斯拉夫语族是印欧语系的一个语族，产生于斯拉夫民族。可分为东斯拉夫语支、南斯拉夫语支及西斯拉夫语支，东斯拉夫语支及南斯拉夫语支使用西里尔字母，但有一例外，塞尔维亚语和克罗地亚语原是同一种语言，由于宗教的原因，塞尔维亚语用西里尔字母书写，克罗地亚语用拉丁字母书写，两种字母可以自由转写。波斯尼亚语和斯洛文尼亚语用拉丁字母书写。（见en:Differences between standard Serbian, Croatian and Bosnian。）西斯拉夫语支使用拉丁字母。

The Slavic languages (also called Slavonic languages) are the Indo-European languages native to the Slavic peoples, originally from Eastern Europe. They are thought to descend from a proto-language called Proto-Slavic spoken during the Early Middle Ages, which in turn is thought to have descended from the earlier Proto-Balto-Slavic language, linking the Slavic languages to the Baltic languages in a Balto-Slavic group within the Indo-European family.