Altstadt (German: [ˈalt.ʃtat] ^ⓘ, literally: "Old town"), more precisely Hamburg-Altstadt – as not to be mistaken with Hamburg-Altona-Altstadt – is one of the inner-city districts of the Free and Hanseatic City of Hamburg, Germany.

The area of today's Altstadt had a minor Bronze Age settlement dating from the 9th or 8th century BC. An Ingaevonian settlement at this location was known by the name "Treva" – a strategic trading node on amber routes during Iron Age and Late Antiquity.

In the 8th century CE, Saxon merchants established what was to become the nucleus of Hamburg: the "Hammaburg", then a refuge fort located at today's Domplatz, the site of the former cathedral.^[3] Under Frankish rule, a baptistery was installed in 804 and Hammaburg strengthened by Charlemagne in 811. Quickly, the place grew to a sizable market town, declared a bishop's see in 831, an archbishop's see a year later. For the next 600 years, the history of Altstadt was equivalent to the history of Hamburg.

By the end of the 15th century, the then Hanseatic city-republic and free Imperial city had accumulated various territorial possessions in its hinterland. Eventually, Hamburg's 13th-century city-walls received a couple of extensions: first in the 1530s, then again in the 1620s to include all of adjacent Neustadt.

Regarding the urban history of Altstadt, only a few structures prior to the 17th century are left: repeated damming and diverting of the Alster and its canals, the Great Fire (1842), the bombing in World War II (1941–1945) and modern infrastructure projects (particularly during the 1880s to 1900s, 1920s and 1950s to 1970s) left Hamburg's inner-city with a mainly 19th and 20th-century built environment.

The Hammaburg, Hamburg's origin, was established on a former headland, between the confluences of Alster and Bille into the Elbe Stream. Over the centuries Alster and Bille were impoldered and diverted several times, resulting in an ever different geography. Today, Altstadt is bordered by Alster (i.e. Alsterfleet and Binnenalster) to the West and North-West, the rail tracks of Hamburg-Altona link line and Hauptbahnhof to the East, and Zollkanal to the South.

Districts bordering Hamburg-Altstadt are (starting clockwise in the North-West): Neustadt, St. Georg, Hammerbrook and HafenCity.

These are the results of Altstadt in the Hamburg state election: