|Promoted|| Tromsø |
|Relegated|| Kongsvinger |
|Goals scored||781 (3.25 per match)|
|Top goalscorer|| Henrik Udahl |
|Biggest home win|| KFUM Oslo 6–0 Øygarden |
(7 December 2020)
|Biggest away win|| Ull/Kisa 0–7 Tromsø |
(29 September 2020)
|Highest scoring|| Stjørdals-Blink 5–4 Sandnes Ulf |
(14 September 2020)
Tromsø 5–4 Åsane
(3 October 2020)
Raufoss 5–4 KFUM Oslo
(13 December 2020)
|Longest winning run||8 games|
|Longest unbeaten run||14 games|
|Longest winless run||10 games|
|Longest losing run||6 games|
The 2020 1. divisjon (referred to as OBOS-ligaen for sponsorship reasons) was a Norwegian second-tier football league season.
In the 2019 1. divisjon, Aalesund, Sandefjord and Start were promoted to the 2020 Eliteserien, while Notodden, Skeid and Tromsdalen were relegated to the 2020 2. divisjon.
Lillestrøm, Tromsø and Ranheim were relegated from the 2019 Eliteserien, while Stjørdals-Blink, Grorud and Åsane were promoted from the 2019 2. divisjon.
|Åsane||Bergen||Myrdal gress||2,180||Morten Røssland|
|Grorud||Oslo||Grorud Matchbane||1,700||Eirik Kjønø|
|HamKam||Hamar||Briskeby Arena||7,800||Kjetil Rekdal|
|Jerv||Grimstad||Levermyr Stadion||3,300||Arne Sandstø|
|KFUM Oslo||Oslo||KFUM Arena||1,500||Jørgen Isnes|
|Kongsvinger||Kongsvinger||Gjemselund Stadion||5,824||Espen Nystuen (interim)|
|Lillestrøm||Lillestrøm||Åråsen Stadion||11,500||Geir Bakke|
|Øygarden 1||Øygarden||Ågotnes Stadion||1,200||Mons Ivar Mjelde|
|Ranheim||Trondheim||Extra Arena||3,000||Svein Maalen|
|Raufoss||Raufoss||Nammo Stadion||1,800||Christian Johnsen|
|Sandnes Ulf||Sandnes||Øster Hus Arena||6,046||Steffen Landro|
|Sogndal||Sogndal||Fosshaugane Campus||5,622||Eirik Bakke|
|Stjørdals-Blink||Stjørdalshalsen||M.U.S Stadion||2,000||Roar Vikvang|
|Strømmen||Strømmen||Strømmen Stadion||2,000||Ole Martin Nesselquist|
|Tromsø||Tromsø||Alfheim Stadion||6,687||Gaute Helstrup|
|Ull/Kisa||Jessheim||Jessheim Stadion||4,500||Trond Fredriksen|
|Team||Outgoing manager||Manner of departure||Date of vacancy||Table||Incoming manager||Date of appointment||Table|
|Sandnes Ulf||Bengt Sæternes||Contract expired||31 December 2019||Pre-season||Steffen Landro||13 November 2019||Pre-season|
|Øygarden||Steffen Landro||Signed by Sandnes Ulf||13 November 2019||Bryant Lazaro||17 February 2020|
|Kongsvinger||Vitor Gazimba||Mutual consent||11 December 2019||Mika Lehkosuo||18 December 2019|
|Lillestrøm||Tom Nordlie||Contract expired||11 December 2019||Geir Bakke||1 January 2020|
|Tromsø||Simo Valakari||Mutual consent||20 April 2020||Gaute Helstrup||20 May 2020|
|HamKam||Gaute Helstrup||Signed by Tromsø||19 May 2020||Espen Olsen||21 May 2020|
|HamKam||Espen Olsen||Structural changes||7 August 2020||16th||Geir Frigård (interim)||7 August 2020||16th|
|HamKam||Geir Frigård (interim)||End of caretaker spell||15 August 2020||16th||Kjetil Rekdal||15 August 2020||16th|
|Øygarden||Bryant Lazaro||Mutual consent||18 September 2020||14th||Mons Ivar Mjelde||18 September 2020||14th|
|Kongsvinger||Mika Lehkosuo||Structural changes||30 September 2020||16th||Espen Nystuen (interim)||30 September 2020||16th|
|Pos||Team||Pld||W||D||L||GF||GA||GD||Pts||Promotion, qualification or relegation|
|1||Tromsø (C, P)||30||19||6||5||60||29||+31||63||Promotion to Eliteserien|
|3||Sogndal||30||15||6||9||57||36||+21||51||Qualification for the promotion play-offs|
|14||Stjørdals-Blink (O)||30||8||9||13||52||59||−7||33||Qualification for the relegation play-offs|
|15||Kongsvinger (R)||30||6||10||14||35||53||−18||28||Relegation to 2. divisjon|
|Promotion to Eliteserien|
|Relegation to 2. divisjon|
The 3rd to 6th placed teams took part in the promotion play-offs; these were single leg knockout matches. In the first round, the 5th placed team played at home against the 6th placed team. The winner of the first round then met the 4th placed team on away ground in the second round. The winner of the second round then met the 3rd placed team on away ground. The winner of the third round advanced to play the 14th placed team in Eliteserien on neutral ground in the Eliteserien play-offs for a spot in the top-flight next season.
The 14th placed team took part in a two-legged play-off against the winners of the 2. divisjon play-offs to decide who would play in the 2021 1. divisjon.
IL Stjørdals-Blink won 6–1 on aggregate.
1. divisjon or OBOS-ligaen is the second-highest level of the Norwegian football league system. Each year, the top finishing teams in the 1. divisjon are promoted to the Eliteserien, and the lowest finishing teams are relegated to 2. divisjon.
The 1998 Norwegian Football Cup was the 93rd edition of the Norwegian Football Cup and was won by Stabæk after defeating Rosenborg in the final at Ullevaal Stadion on 1 November.
The 2016 Norwegian Football Cup was the 111th season of the Norwegian annual knock-out football tournament. It began with qualification matches in March 2016. The first round was played on 13 April 2016 and the tournament concluded with the final on 20 November 2016.
The 2018 1. divisjon was a Norwegian second-tier football league season.
The 2018 season is Stabæk's fifth season back in the Eliteserien following their relegation in 2012, their 22nd season in the top flight of Norwegian football.
The 2019 Eliteserien was the 75th season of top-tier football in Norway.
The 2019 1. divisjon was a Norwegian second-tier football league season.
The 2019 Norwegian Football Cup was the 114th season of the Norwegian annual knock-out football tournament. It began with qualification matches in March and April 2019. The first round was played on 1 May 2019 and the tournament concluded with the final on 8 December 2019.
The 2019 season was Tromsø's fifth season in the Tippeligaen following their relegation at the end of the 2013 and their 32nd season in the top flight of Norwegian football. Tromsø finished the season in 15th position, earning relegation back to the 1. divisjon, whilst also reaching the Third Round of the Norwegian Cup where they were knocked out by Kongsvinger.
The 2018 season was Lillestrøm's 43rd consecutive, and final, year in Eliteserien. Lillestrøm finished the season in 14th position, entering the Relegation play-offs where they were defeated on away goals by IK Start after the two-legged affair ended 5-5. In the Norwegian Cup, Lillestrøm reached the Third Round before defeat to Strømmen.
The 2020 campaign will be Lillestrøm 103rd competitive season since the club were founded. During this season the club will be competing in the following competitions: 1. divisjon, Norwegian Cup.
The 2021 Eliteserien will be the 77th season of top-tier football in Norway.
The 2021 1. divisjon is a Norwegian second-tier football league season.