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Altendorf may refer to:
- Altendorf, Schwyz, a municipality in Switzerland
- Altendorf, Upper Franconia, a town in the district of Bamberg, Bavaria, Germany
- Altendorf, Upper Palatinate, a town in the district of Schwandorf, Bavaria, Germany
- Altendorf (Sebnitz), a village in Sebnitz municipality, Saxony, Germany
- Altendorf, Austria, a town in the district of Neunkirchen in Lower Austria
- Altendorf GmbH, a woodworking machinery manufacturer from Minden, North Rhine-Westphalia, Germany
- Altendorf (megalithic tomb), an archaeological site near Naumburg, Hesse, Germany
- Altendorf, a village in the municipality of Brome, Germany
- Altendorf, Essen, a borough of the city of Essen, North Rhine-Westphalia, Germany
- Spišská Stará Ves in Slovakia