The 2021 season is Rosenborg's 42nd consecutive year in the top flight now known as Eliteserien, their 53rd season in the top flight of Norwegian football. They will participate in Eliteserien, Cup and Europa Conference League entering at the Second Qualifying round. This will be Åge Hareide's first full season as Rosenborg manager. The start of the season was postponed from 5 April to 8 May due to the COVID-19 pandemic.