LASK
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| Full name | Linzer Athletik-Sport-Klub | |||
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| Founded | 7 August 1899 as Athletiksportklub Siegfried | |||
| Ground | Raiffeisen Arena | |||
| Capacity | 19,080 | |||
| Owner | LASK GmbH | |||
| President | Siegmund Gruber | |||
| Head coach | Dietmar Kühbauer | |||
| League | Austrian Bundesliga | |||
| 2025–26 | Austrian Bundesliga, 1st of 12 (champions) | |||
| Website | lask.at | |||
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Linzer Athletik-Sport-Klub (German pronunciation: [lask] ⓘ), or Linzer ASK, is an Austrian professional football club based in Upper-Austrian state capital Linz. It is the oldest football club in that region, and plays in the Austrian Football Bundesliga, the top tier of Austrian football. The club's colours are black and white. The women's team plays in the highest division of Austrian women's football.
It is one of the few clubs of the country's higher divisions that, since coming into existence, never exhibited a sponsor in the official club name.
In 1965, the club became the first team outside Vienna to win the Austrian football championship. They won their second Austrian football championship in 2026. The club currently plays its home games at the Raiffeisen Arena in Linz.