Wrocławski Klub Sportowy Śląsk Wrocław Spółka Akcyjna, commonly known as Śląsk Wrocław or simply Śląsk, is a Polish football club based in Wrocław that plays in Ekstraklasa, the highest level of the Polish football league system. The club was founded in 1947. In 1977, Śląsk Wrocław won the Polish league championship for the first time. The club has also won the Polish Cup twice, the Polish Super Cup twice and the Ekstraklasa Cup once. The club's home is Stadion Wrocław, a 45,105 capacity stadium in Wrocław.