Altstadt, German for "old town", is a historical city centre.
Altstadt may also refer to:
- Altstadt (Düsseldorf), a bar quarter in Düsseldorf, Germany
- Altstadt (Frankfurt am Main), a quarter in the Ortsbezirk Innenstadt
- Altstadt (Königsberg), a quarter of central Königsberg, Germany
- Altstadt (Munich), a part of Munich, Germany
- Altstadt Salzburg, the historic city centre of Salzburg, Austria
- Altstadt Spandau, the historic centre of Spandau, Berlin
- Altstadt (Zürich), the old town of Zürich, Switzerland
- Altstadt Church, a medieval church in Königsberg, Germany
- Altstadt Gymnasium, a secondary school in Königsberg, Germany