下索布语（Dolnoserbšćina，读音：[ˈdɔlnɔˌsɛrskʲi]），亦称低地索布语，在口语中以及部分地区也称“文德语（Wendisch）”，是现今使用于德国东部的一种少数民族语言，是一种西斯拉夫语支的语言，为索布语的分支之一，其另一分支为上索布语。

下索布语主要在德国勃兰登堡州科特布斯及周边地区使用，这些地区的路牌通常都会采用德语和下索布语两种语言书写。在科特布斯有一所下索布语高级中学（Niedersorbisches Gymnasium Cottbus），主要进行下索布语的传承保护工作。

Lower Sorbian (Dolnoserbski) is a Slavic minority language spoken in eastern Germany in the historical province of Lower Lusatia, today part of Brandenburg. It is one of the two literary Sorbian languages, the other being Upper Sorbian.

Lower Sorbian is spoken in and around the city of Cottbus in Brandenburg. Signs in this region are usually bilingual, and Cottbus has a Gymnasium where one language of instruction is Lower Sorbian. It is a heavily endangered language. Most native speakers are in the oldest generation today.