Altenau (disambiguation)

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