The 2021 Eliteserien was the 77th completed season of top-tier football in Norway. This was fifth season of Eliteserien as rebranding from Tippeligaen.
The season was originally scheduled to begin on 5 April and end on 27 November 2021, not including play-off matches. Restrictions enforced by the government due to the COVID-19 pandemic forced the Norwegian Football Federation to postpone the start several times and the league started on 9 May 2021. The last round was played on 12 December 2021.
Bodø/Glimt were the defending champions. Tromsø and Lillestrøm joined as the promoted clubs from the 2020 Norwegian First Division. They replaced Aalesund and IK Start who were relegated to the 2021 Norwegian First Division.
Sixteen teams competed in the league – the top fourteen teams from the previous season, and two teams promoted from Norwegian First Division. The promoted teams were Tromsø and Lillestrøm, both returning to the top flight after an absence of just one year. They replaced Aalesund and IK Start, both relegated after a season's presence.
The 14th-placed team in the Eliteserien, Brann, played against the winners of the First Division promotion play-offs, Jerv, on neutral ground to decide who would play in the Eliteserien next season.
4–4 after extra time. Jerv won 8–7 on penalties and were promoted to the Eliteserien; Brann were relegated to the Norwegian First Division.
4 Player scored 4 goals
(H) – Home team
(A) – Away team
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