Nienstedten is a quarter in the city of Hamburg, Germany. It belongs to the Altona borough on the right bank of the Elbe river. Nienstedten is home to the International Tribunal for the Law of the Sea. In 2006 the population was 6,783.
In 2006 according to the statistical office of Hamburg and Schleswig-Holstein, Nienstedten has a total area of 4.4 km². The northern border of Nienstedten to the quarter Osdorf is along the railway tracks of the city train. In the West is the quarter Blankenese. In the South is the river Elbe the border to Finkenwerder, a quarter of the Hamburg-Mitte borough and in the East is the quarter Othmarschen.
In 2006 Nienstedten has 6,783 inhabitants. The population density was 1,545/km2 (4,002/sq mi). 18.7% were children under the age of 18, and 24.4% were 65 years of age or older. 9.8% were resident aliens. 74 people were registered as unemployed and 1,433 were employees subject to social insurance contributions.
In 1999 there were 3,044 households out of which 21% had children under the age of 18 living with them and 40.6% of all households were made up of individuals. The average household size was 2.12.