Ernst-Happel-Stadion, known as Praterstadion until 1992, sometimes also called Wiener-Stadion, is a football stadium in Leopoldstadt, the 2nd district of Austria's capital Vienna. With 50,865 seats, it is the largest stadium in Austria. It was built between 1929 and 1931 for the second Workers' Olympiad to the design of German architect Otto Ernst Schweizer. The stadium was renamed in honour of Austrian footballer Ernst Happel following his death in 1992. The stadium hosted seven games in UEFA Euro 2008, including the final which saw Spain triumph over Germany.

Leopoldstadt is the 2nd municipal district of Vienna in Austria. As of 1 January 2016, there are 103,233 inhabitants over 19.27 km2 (7 sq mi). It is situated in the heart of the city and, together with Brigittenau, forms a large island surrounded by the Danube Canal and, to the north, the Danube. It is named after Leopold I, Holy Roman Emperor. Due to its relatively high percentage of Jewish inhabitants before the Holocaust, Leopoldstadt gained the nickname Mazzesinsel. This context was a significant aspect for the district twinning with the New York City borough Brooklyn in 2007.