2021 Rosenborg BK season

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.

Winter
In:

Out:

Summer
In:

Out:

Appearances and goals

 * colspan="14"|Players away from Rosenborg on loan:
 * colspan="14"|Players away from Rosenborg on loan:


 * colspan="14"|Players who appeared for Rosenborg no longer at the club:
 * colspan="14"|Players who appeared for Rosenborg no longer at the club:


 * }