Amt Unterspreewald is an Amt ("collective municipality") in the district of Dahme-Spreewald, in Brandenburg, Germany. Its seat is in the town Golßen.

The Amt Unterspreewald consists of the following municipalities:

1. Bersteland
2. Drahnsdorf
3. Golßen
4. Kasel-Golzig
5. Krausnick-Groß Wasserburg
6. Rietzneuendorf-Staakow
7. Schlepzig
8. Schönwald
9. Steinreich
10. Unterspreewald

Demography

• 
  Development of Population since 1875 within the Current Boundaries (Blue Line: Population; Dotted Line: Comparison to Population Development of Brandenburg state; Grey Background: Time of Nazi rule; Red Background: Time of Communist rule)
• 
  Recent Population Development and Projections (Population Development before Census 2011 (blue line); Recent Population Development according to the Census in Germany in 2011 (blue bordered line); Official projections for 2005-2030 (yellow line); for 2017-2030 (scarlet line); for 2020-2030 (green line)