Altenau is a town in Lower Saxony.
Altenau may also refer to:
- Altenau (Oker), a tributary of the Oker in eastern Lower Saxony
- Altenau (Alme), a tributary of the Alme in eastern North Rhine-Westphalia
- Altenau, a part of Mühlberg, Brandenburg, Germany
People with the surname
- Cornelis Altenau (died 1558), Danish-German builder
| This disambiguation page lists articles associated with the title Altenau.
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