Dahme-Spreewald III is an electoral constituency (German: Wahlkreis) represented in the Landtag of Brandenburg. It elects one member via first-past-the-post voting. Under the constituency numbering system, it is designated as constituency 28. It is located in within the district of Dahme-Spreewald.
The constituency includes the town of Lübben, as well as the communities Heideblick, Heidesee, and Märkische Heide, and the districts of Lieberose/Oberspreewald, Schenkenländchen, and Unterspreewald.
There were 62,919 eligible voters in 2024.