|Relegated|| Åsane |
|Goals scored||728 (3.03 per match)|
|Top goalscorer||Tommy Høiland (21 goals)|
|Biggest home win|| Kongsvinger 6–0 Sandnes Ulf |
(7 August 2018)
|Biggest away win|| Strømmen 1–6 Viking |
(1 July 2018)
Åsane 0–5 Strømmen
(4 November 2018)
|Highest scoring|| Ull/Kisa 4–5 Viking |
(29 April 2018)
Kongsvinger 7–2 Åsane
(7 October 2018)
|Longest winning run||6 games|
|Longest unbeaten run||13 games|
|Longest winless run||20 games|
|Longest losing run||6 games|
Viking 3–1 Kongsvinger
(11 November 2018)
Tromsdalen 3–1 Nest-Sotra
(27 May 2018)
|Average attendance||1,697 19.3%|
The 2018 1. divisjon (referred to as OBOS-ligaen for sponsorship reasons) was a Norwegian second-tier football league season.
The season began on 2 April 2018 and ended on 11 November 2018 (not including playoff matches).
In the 2017 1. divisjon, Bodø/Glimt, Start and Ranheim were promoted to the 2018 Eliteserien, while Fredrikstad, Elverum and Arendal were relegated to the 2018 2. divisjon.
Sogndal, Aalesund and Viking were relegated from the 2017 Eliteserien, while HamKam, Nest-Sotra and Notodden were promoted from the 2017 2. divisjon.
|Aalesund||Ålesund||Color Line Stadion||10,778||Lars Bohinen|
|Florø||Florø||Florø Stadion||2,700||Terje Rognsø|
|HamKam||Hamar||Briskeby Arena||7,800||Kevin Knappen|
|Jerv||Grimstad||Levermyr Stadion||3,300||Arne Sandstø|
|Kongsvinger||Kongsvinger||Gjemselund Stadion||5,824||Mark Dempsey|
|Levanger||Levanger||TOBB Arena||2,100||Roger Naustan|
|Mjøndalen||Mjøndalen||Isachsen Stadion||4,200||Vegard Hansen|
|Nest-Sotra||Sotra||Ågotnes Stadion||1,200||Steffen Landro|
|Sandnes Ulf||Sandnes||Sandnes Stadion||4,969||Bengt Sæternes|
|Sogndal||Sogndal||Fosshaugane Campus||5,622||Eirik Bakke|
|Strømmen||Strømmen||Strømmen Stadion||1,850||Espen Olsen|
|Tromsdalen||Tromsdalen||TUIL Arena||1,695||Gaute Helstrup|
|Ull/Kisa||Jessheim||Jessheim Stadion||3,500||Vegard Skogheim|
|Viking||Stavanger||Viking Stadion||15,900||Bjarne Berntsen|
|Åsane||Åsane||Myrdal Gress||2,180||Mons Ivar Mjelde|
|Team||Outgoing manager||Manner of departure||Date of vacancy||Table||Incoming manager||Date of appointment||Table|
|Aalesund||Trond Fredriksen||Sacked||12 December 2017||Pre-season||Lars Bohinen||20 December 2017||Pre-season|
|Viking||Bjarte Lunde Aarsheim (interim)||End of caretaker spell||18 December 2017||Pre-season||Bjarne Berntsen||18 December 2017||Pre-season|
|Levanger||Magnus Powell||Contract expired||31 December 2017||Pre-season||Roger Naustan||1 January 2018||Pre-season|
|Kongsvinger||Hans-Erik Eriksen||Sacked||30 April 2018||15th||Mark Dempsey||11 June 2018||10th|
|Pos||Team||Pld||W||D||L||GF||GA||GD||Pts||Promotion, qualification or relegation|
|1||Viking (C, P)||30||20||1||9||68||44||+24||61||Promotion to Eliteserien|
|3||Aalesund||30||18||5||7||58||31||+27||59||Qualification for the promotion play-offs|
|14||Åsane (R)||30||9||6||15||38||57||−19||33||Qualification for the relegation play-offs|
|15||Florø (R)||30||8||3||19||27||59||−32||27||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 3rd placed team played at home against the 6th placed team, and the 4th placed team played at home against the 5th placed team. The two winners then played against each other in the second round, where the team with the highest table position played at home. The winner of the second round, Aalesund, advanced to play the 14th placed team in Eliteserien over two legs in the Eliteserien play-offs for a spot in the top-flight next season.
The 14th placed team, Åsane, took part in a two-legged play-off against KFUM Oslo, the winners of the 2. divisjon play-offs, to decide who would play in the 2019 1. divisjon. KFUM Oslo won 4-3 on aggregate and were therefore promoted, while Åsane got relegated.
KFUM Oslo won 4–3 on aggregate.
1: Team played last season in Eliteserien.
2: Team played last season in 2. divisjon.
|Manager of the season||Steffen Landro||Nest-Sotra|
|Player of the season||Johnny Furdal||Nest-Sotra / Viking|
|Young player of the season||Kristian Thorstvedt||Viking|
|OBOS Player of the season||Hólmbert Friðjónsson||Aalesund|
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 2015 1. divisjon was a Norwegian second-tier football league season. The league was contested by 16 teams, and the top two teams were promoted to Tippeligaen, while the teams placed from third to sixth place played a promotion-playoff against the 14th-placed team in Tippeligaen to win promotion. The bottom four teams were relegated to the 2. divisjon.
The 2016 Tippeligaen was the 72nd completed season of top-tier football in Norway. The competition began on 11 March 2016. Due to the 2016 UEFA European Championship, there was a break between the rounds played on 29 May and 3 July. The decisive matches of the home-and-away season were played on 6 November 2016. A promotion/relegation play-off between the third-from-bottom team of the Tippeligaen and the winner of the promotion play-offs of the 2016 1. divisjon was contested on 30 November and 4 December 2016.
The 2016 1. divisjon was a Norwegian second-tier football league season. The league was contested by 16 teams, and the top two teams were promoted to Tippeligaen, while the teams placed from third to sixth place played a promotion-playoff against the 14th-placed team in Tippeligaen to win promotion. The bottom four teams were be relegated to the 2. divisjon.
The 2017 Eliteserien was the 73rd completed season of top-tier football in Norway. The season began on 1 April 2017 and ended on 26 November 2017, not including play-off matches. Rosenborg were the defending champions, while Kristiansund and Sandefjord entered as the promoted teams from the 2016 1. divisjon.
The 2017 1. divisjon was a Norwegian second-tier football league season.
The 2018 Eliteserien was the 74th completed season of top-tier football in Norway.
The 2018 2. divisjon was a Norwegian football third-tier league season. The league consisted of 28 teams divided into 2 groups of 14 teams.
The 2017 Eliteserien Promotion/Relagetion play-offs was the 44th time a spot in the Eliteserien was decided by play-off matches between top tier and second level clubs.
The 2015 Eliteserien Promotion/Relegation play-offs was the 42nd time a spot in the Norwegian top flight was decided by play-off matches between top tier and second level clubs.
The 2019 Eliteserien was the 75th season of top-tier football in Norway.
The 2018 Eliteserien Promotion/Relagetion play-offs was the 45th time a spot in the Eliteserien was decided by play-off matches between top tier and second level clubs. In the play-offs, five teams compete for one spot in the 2019 Eliteserien.
The 2019 1. divisjon was a Norwegian second-tier football league season.
The 2019 2. divisjon was a Norwegian football third-tier league season. The league consisted of 28 teams divided into 2 groups of 14 teams.
The 2020 Eliteserien was the 76th season of top-tier football in Norway.
The 2020 1. divisjon was a Norwegian second-tier football league season.
The 2019 Eliteserien Promotion/Relagetion play-offs is the 46th time a spot in the Eliteserien will be decided by play-off matches between top tier and second level clubs. In the play-offs, five teams compete for one spot in the 2020 Eliteserien.
The 2020 2. divisjon was a Norwegian football third-tier league season. The league consisted of 28 teams divided into 2 groups of 14 teams. The groups were announced by the NFF on 7 December 2019.
The 2020 Eliteserien Promotion/Relegation play-offs was the 47th time a spot in the Eliteserien was decided by play-off matches between top tier and second-level clubs. In the play-offs, five teams competed for one spot in the 2021 Eliteserien.
The 2021 1. divisjon is a Norwegian second-tier football league season.