| Competition: | Norwegian Second Division |
| Season: | 2021 |
| Dates: | 19 June 2021 – 14 November 2021 |
| Winners: | Kongsvinger (Group 1) Skeid (Group 2) |
| Promoted: | Kongsvinger Skeid |
| Relegated: | Florø Fløya Senja Fram Larvik Nardo Rosenborg 2 |
| Matches: | 364 |
| Total Goals: | 1282 |
| League Topscorer: | Group 1: Adem Güven (21 goals) Group 2: Melvin Frithzell & Abel William Stensrud (22 goals) |
| Biggest Home Win: | |
| Biggest Away Win: | |
| Highest Scoring: | |
| Prevseason: | 2020 |
| Nextseason: | 2022 |
The 2021 Norwegian Second Division (referred to as PostNord-ligaen for sponsorship reasons) was a Norwegian football third-tier league season. The league consisted of 28 teams divided into 2 groups of 14 teams.
The league was played as a double round-robin tournament, where all teams played 26 matches. 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.[4]
The following teams changed division since the 2020 season.
The following 14 clubs compete in group 1:[5] [6]
| Club | Location | Stadium | Capacity |
|---|---|---|---|
| Alta | Alta | Finnmarkshallen | 1,200 |
| Asker | Asker | Føyka Stadion | 2,400 |
| Brattvåg | Brattvåg | Brattvåg Stadion | 1,500 |
| Bærum | Bærum | Sandvika Stadion | 1,500 |
| Eidsvold Turn | Eidsvoll | Myhrer Stadion | 1,500 |
| Florø | Florø | Florø Stadion | 2,800 |
| Fløya | Tromsø | Fløya Arena | 1,500 |
| Hødd | Ulsteinvik | Nye Høddvoll | 4,081 |
| Kongsvinger | Kongsvinger | Gjemselund Stadion | 5,824 |
| Kvik Halden | Halden | Halden Stadion | 4,200 |
| Moss | Moss | Melløs Stadion | 4,000 |
| Senja | Silsand | Senja Stadion | 1,500 |
| Tromsdalen | Tromsø | TUIL Arena | 3,000 |
| Vålerenga 2 | Oslo | Intility Arena | 16,555 |
| Rank | Player | Club | Goals[7] |
|---|---|---|---|
| 1 |  Adem Güven | Kongsvinger | 21 |
| 2 | Didrik Sereba | Asker | 19 |
| 3 | Robin Hjelmeseth | Hødd | 15 |
| Martin Hoel Andersen | Kongsvinger | ||
| 5 | Oskar Løken | Hødd | 14 |
| 6 | Brage Berg Pedersen | Kongsvinger | 13 |
| Sondre Sandnes Beite | Brattvåg | ||
| 8 | Morten Gamst Pedersen | Alta | 12 |
| 9 | Sigurd Grønli | Tromsdalen | 11 |
| Øystein Lundblad Næsheim | Kvik Halden | ||
| Ole Andreas Nesset | Eidsvold Turn |
The following 14 clubs compete in group 2:[5] [8]
| Club | Location | Stadium | Capacity |
|---|---|---|---|
| Arendal | Arendal | Norac Stadion | 5,000 |
| Egersund | Egersund | Idrettsparken | 2,000 |
| Fløy | Flekkerøy | Arkicon Arena | 2,000 |
| Fram Larvik | Larvik | Framparken | 2,500 |
| Kjelsås | Oslo | Grefsen Stadion | 2,000 |
| Levanger | Levanger | TOBB Arena | 2,200 |
| Nardo | Trondheim | Nissekollen Idrettspark | 1,800 |
| Notodden | Notodden | Optime Arena | 4,000 |
| Odd 2 | Skien | Skagerak Arena | 11,767 |
| Rosenborg 2 | Trondheim | SalMar Banen | 1,000 |
| Skeid | Oslo | Nordre Åsen Kunstgress | 2,500 |
| Sotra | Sotra | Straume Stadion | 1,200 |
| Vard Haugesund | Haugesund | Haugesund Sparebank Arena | 8,754 |
| Øygarden | Ågotnes | Ågotnes Stadion | 1,200 |
| Rank | Player | Club | Goals[9] |
|---|---|---|---|
| 1 |  Melvin Frithzell | Notodden | 22 |
| Abel William Stensrud | Skeid | ||
| 3 | Arne Gunnes | Levanger | 21 |
| 4 | Andreas Hellum | Arendal | 17 |
| 5 | Erling Myklebust | Vard Haugesund | 16 |
| 6 | Johnny Buduson | Skeid | 15 |
| 7 |  Patrik Johannesen | Egersund | 13 |
| Stian Michalsen | Egersund | ||
| 9 | Ole Erik Midtskogen | Kjelsås | 11 |
| 10 | Lars Kilen | Sotra | 10 |
| Jørgen Voilås | Notodden |
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. The winner went on to play against the 14th-placed team in the First Division for a place in the First Division next season.
Hødd won 4–3 on aggregate.