Alsterdorf is a quarter in the Hamburg-Nord borough of the Hamburg, Germany. The name derives from the river Alster and its artificial lakes Außenalster and Binnenalster in the centre of Hamburg. In 2020 the population was 15,227.

Hamburg-Nord is one of the seven boroughs of the Free and Hanseatic City of Hamburg, in northern Germany. In 2020, according to the residents registration office, the population was 315,514 in an area of 57.5 km2.