The 2020 season was Viking's 2nd consecutive year in Eliteserien, and their 70th season in the top flight of Norwegian football. The club participated in the Eliteserien and the UEFA Europa League. The Norwegian Cup was cancelled.
On 12 December 2019, Viking announced the friendly matches to be played in pre-season.
On 12 March 2020, all football in Norway was suspended due to the COVID-19 pandemic.
The Eliteserien fixtures were announced on 19 December 2019. The season was originally scheduled to start on 4 April, but due to the coronavirus pandemic the football season was delayed. The new start date for the league was 16 June.
The 2020 edition of the Norwegian Football Cup was cancelled.
|- |colspan="14"|Players away from Viking on loan:
|- |colspan="14"|Players who left Viking during the season: