Ljungskile SK, formed in 1926, is famous for their promotions between 1990 and 1997. In 1990, Ljungskile SK was playing in Swedish "Division 5" and gained promotion to "Division 4", "Division 3", "Division 2", "Division 1" until they reached Allsvenskan in 1997.
The club soon gained sponsorship by the swimwear producer Panos Emporio after advancing for the first time to Allsvenskan (LSK defeated Umeå FC when attending the qualifying round in November 1996), and played under the name Panos Ljungskile SK from 1997 to 2002. The club was relegated two times (1997 and 2000) during these years, and played some years in Division 2 Västra Götaland before they managed to gain promotion back to Superettan in late 2004, defeating Väsby IK in the qualifying round. On October 21, 2007 the club gained promotion for the second time ever to Allsvenskan by defeating Landskrona BoIS away. During 2008 the club managed to replace IFK Uddevalla as Bohuslän's most successful club in the history of Allsvenskan.