Fußballclub Gelsenkirchen-Schalke 04 e. V., commonly known as FC Schalke 04, Schalke or abbreviated as S04, is a professional German football and multi-sports club originally from the Schalke district of Gelsenkirchen, North Rhine-Westphalia. The "04" in the club's name derives from its formation in 1904. Schalke has long been one of the most popular professional football teams and multi-sports club in Germany, even though the club's heyday was in the 1930s and 1940s. Schalke play in the 2. Bundesliga, the second tier of the German football league system. As of June 2018, the club has 155,000 members, making it the second-largest sports club in Germany and the fourth-largest sports club in the world in terms of membership. Other activities offered by the club include athletics (track and field), basketball, handball, table tennis, winter sports and eSports.
Founded in 1904, Schalke has won seven German championships, five DFB-Pokals, one DFL-Supercup and one UEFA Cup.
Schalke also succeeded as the first German club to win a cup double in 1937.
Since 2001, Schalke's stadium has been the Veltins-Arena. Schalke holds a long-standing rivalry with Ruhr neighbours Borussia Dortmund, arguably one of the most widespread and well-known rivalries in German football, and matches between the two teams are referred to as the Revierderby.