| Tettau | |
| Image Coa: | DE-BB 12-0-66-316 Tettau COA.svg |
| Coordinates: | 51.4333°N 57°W |
| Image Plan: | Tettau in OSL.svg |
| State: | Brandenburg |
| District: | Oberspreewald-Lausitz |
| Amt: | Ortrand |
| Elevation: | 94 |
| Area: | 8.80 |
| Postal Code: | 01945 |
| Area Code: | 03574 |
| Licence: | OSL |
| Gemeindeschlüssel: | 12 0 66 316 |
| Mayor: | Joachim Nitzsche[1] |
| Leader Term: | 2024 - 29 |
Tettau is a municipality in the Oberspreewald-Lausitz district, in Upper Lusatia, Brandenburg, Germany.
From 1815 to 1825, Tettau was part of the Prussian Province of Brandenburg, from 1825 to 1919 of the Province of Silesia, from 1919 to 1938 of the Province of Lower Silesia, again from 1938 to 1941 of the Province of Silesia and again from 1941 to 1945 of the Province of Lower Silesia. From 1945 to 1952 it was part of Saxony and from 1952 to 1990 of the Bezirk Cottbus of East Germany.