Westfalenstadion is a football stadium in Dortmund, North Rhine-Westphalia, Germany, which is the home of Bundesliga club Borussia Dortmund. Officially called Signal Iduna Park for sponsorship reasons, the name derives from the former Prussian province of Westphalia.
The stadium is one of the most famous football grounds in Europe and is renowned for its atmosphere. It has a league capacity of 81,360 (standing and seated) and an international capacity of 65,829 (seated only). It is Germany's largest stadium, the seventh-largest in Europe, and the third-largest home to a top-flight European club after Camp Nou and the Santiago Bernabéu Stadium. It holds the European record for average fan attendance, set in the 2011–2012 season with almost 1.37 million spectators. Sales of annual season tickets amounted to 55,000 in 2015.
The 24,454 capacity Südtribüne (South Bank) is the largest terrace for standing spectators in European football. Famous for the intense atmosphere it breeds, the south terrace has been nicknamed the "Yellow Wall". The Borusseum, the museum of Borussia Dortmund, is near the stadium.
The stadium hosted matches in the 1974 and 2006 FIFA World Cups. It also hosted the 2001 UEFA Cup Final. Various national friendlies and qualification matches for World and European tournaments have been played there as well as matches in European club competitions.