Linzer Athletik-Sport-Klub, commonly known as Linzer ASK or simply LASK, 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 second highest division of Austrian women's football.

Linz is the capital of Upper Austria and third-largest city in Austria. Sitting on the river Danube, the city is located in the far north of Austria, 30 km (19 mi) south of the border with the Czech Republic. As of 1. January 2024, the city has a population of 212.538 and is the 7th largest of all cities on the Danube river.