The 2021 Norwegian Second Division (referred to as PostNord-ligaen for sponsorship reasons) was a Norwegian football third-tier league season.
The season started on 19 June 2021 and concluded on 14 November 2021.
[1][2] Kongsvinger earned promotion from group 1 on 23 October 2021, three rounds before the end of the season.
[3] Skeid secured promotion from group 2 on 6 November 2021, following a 12–0 win against Rosenborg 2.
The teams who finished in second place in their respective group qualified for the promotion play-offs, where they faced each other over two legs.