Lillestrøm B is the reserve team of Eliteserien club Lillestrøm SK. Based at the LSK-hallen in Lillestrøm, the team competes in the Norwegian 3. Divisjon, where reserve sides are permitted to play. The team wears the parent club's traditional yellow and black. As a reserve team, its primary purpose is player development, providing a bridge between the academy and the first team. The B team's history is one of nurturing talent, with countless future Lillestrøm and Norwegian league players having honed their skills here. They do not compete for promotion to higher leagues, but their results are closely watched as an indicator of the club's youth strength. The current squad is a mix of promising teenagers and first-team players needing match fitness. Matches are attended by dedicated fans and club staff monitoring progress. Lillestrøm B is an essential component of the club's long-term sporting strategy.