Lillestrøm Sportsklubb is a Norwegian professional football club from the city of Lillestrøm, just outside of the capital Oslo. They compete in Eliteserien, the top flight of Norwegian football. The club was founded in 1917, after the merger of two local football clubs. Their home ground is Åråsen Stadion, which has a capacity of 12,250 people, while the principal training ground is Lillestrøm stadion, or the indoor arena, LSK-Hallen. The club holds the Norwegian record for the most consecutive years without being relegated. Over the years the club has had around 40 players who have represented the Norwegian national team. There has also been a number of foreigners who have represented the national teams of Sweden, Iceland, Senegal, Finland, Malta, Australia, South Africa, Slovenia, Tunisia, Canada, Somalia, and Nigeria.
The club also have teams in bandy and futsal.