| Type: | Stadtteil |
| Town: | Arendsee |
| Coordinates: | 52.8°N 11.5167°W |
| State: | Sachsen-Anhalt |
| District: | Altmarkkreis Salzwedel |
| Elevation: | 26 |
| Area: | 21.41 |
| Population: | 610 |
| Stand: | 2006-12-31 |
| Postal Code: | 39606 |
| Area Code: | 039003 |
| Licence: | SAW |
Kleinau is a village and a former municipality in the district Altmarkkreis Salzwedel, in Saxony-Anhalt, Germany. Since 1 January 2010, it is part of the town Arendsee.