Ballspielverein Borussia 09 e. V. Dortmund, commonly known as Borussia Dortmund (German pronunciation: [boˈʁʊsi̯aː ˈdɔɐ̯tmʊnt] (listen)),BVB (pronounced [beːfaʊ̯ˈbeː] (listen)), or simply Dortmund (pronounced [ˈdɔʁtmʊnt] (listen)), is a German professional sports club based in Dortmund, North Rhine-Westphalia.

It is best known for its men's professional football team, which plays in the Bundesliga, the top tier of the German football league system.

The club have won eight league championships, five DFB-Pokals, one UEFA Champions League, one Intercontinental Cup, and one UEFA Cup Winners' Cup.

Founded in 1909 by eighteen football players from Dortmund, the football team is part of a large