The 2018 season was Lillestrøm's 43rd consecutive, and final, year in Eliteserien. Lillestrøm finished the season in 14th position, entering the Relegation play-offs where they were defeated on away goals by IK Start after the two-legged affair ended 5-5. In the Norwegian Cup, Lillestrøm reached the Third Round before defeat to Strømmen.