Ballspielverein Borussia 09 e.V. Dortmund, commonly kent as Borussia Dortmund[boˈʁʊsi̯a ˈdɔʁtmʊnt], Dortmund, or BVB, is a German sports club based in Dortmund, North Rhine-Westphalie. The fitbaa team is pairt o a lairge membership-based sports club wi 100,000 members, makkin BVB the third lairgest sports club bi membership in Germany. Dortmund plays in the Bundesliga, the tap tier o the German fitbaa league seestem. Dortmund is ane o the sonsiemaist clubs in German fitbaa history.