Altstadt (Mainz) (Mainz-Altstadt)
- quarter of Mainz, Germany
- Country:
- Local Dialing Code: 06131
- Coordinates: 49° 59' 55" N, 8° 16' 10" E
- GPS tracks (wikiloc): [Link]
- Area: 2.414 sq km
- Wikidata storage: Wikidata: Q880555
- Wikipedia Commons Category: [Link]
- VIAF ID: Alt: [147423216]
- archINFORM location ID: [42442]
Shares border with regions:
Biebrich
- municipal district of the city of Wiesbaden in Hesse, Germany
- Country:
- Postal Code: 65203
- Coordinates: 50° 2' 51" N, 8° 14' 27" E
- GPS tracks (wikiloc): [Link]
- Area: 12.99 sq km