The club was founded on 7 August 1899 as Athletiksportclub Siegfried, the football section was founded in February 1919. The first match was on 4 May 1919 against Fußballverein Wels . LASK lost 1:4. Being the most successful section of the Athletiksportclub it was decided that the name of the club should be Linzer Athletik-Sport-Klub (Linzer ASK). Till the occupation by Germany in 1938 they reached many titels in the Upper Austrian league. In the 1938/39 season they were promoted to the Gauliga XVII, which was then the highest class in Austrian football. But they were relegated the same season.