2015 Norwegian First Division
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 first round of the season was played on 6 April 2015 and the season ended with the last round on 1 November 2015. The playoff-tournament was played between 7 and 21 November 2015.
An agreement with Oslo's housing cooperative OBOS was signed on 15 January 2015, branding the league as OBOS-ligaen until 2021.
Team changes from 2014
In the 2014 1. divisjon, Sandefjord, Tromsø and Mjøndalen won promotion to Tippeligaen, while Alta, HamKam, Tromsdalen and Ull/Kisa were relegated to the 2015 2. divisjon.Sogndal, Sandnes Ulf and Brann, were relegated from the 2014 Tippeligaen, while Follo, Jerv, Levanger and Åsane were promoted from the 2014 2. divisjon.
Teams
| Team | Location | Arena | Capacity | Manager |
| Brann | Bergen | Brann Stadion | 17,686 |  Lars Arne Nilsen |
| Bryne | Bryne | Bryne Stadion | 10,000 | Gaute Larsen |
| Bærum | Sandvika | Sandvika Stadion | 1,815 | Roar Johansen |
| Follo | Ski | Ski Stadion | 2,500 | Hans Erik Eriksen |
| Fredrikstad | Fredrikstad | Fredrikstad Stadion | 12,565 | Håkon Wibe Lund |
| Hødd | Ulsteinvik | Høddvoll Stadion | 3,825 | Sindre Eid |
| Hønefoss | Hønefoss | Aka Arena | 4,120 | Rune Skarsfjord |
| Jerv | Grimstad | J.J. Ugland Stadion – Levermyr | 1,700 | Steinar Pedersen |
| Kristiansund | Kristiansund | Kristiansund Stadion | 3,000 | Christian Michelsen |
| Levanger | Levanger | Moan Fritidspark | 6,000 |  Andreas Holmberg |
| Nest-Sotra | Sotra | Ågotnes Stadion | 2,000 |  Michael Schjønberg |
| Ranheim | Trondheim | DNB Arena | 2,000 | Ola By Rise |
| Sandnes Ulf | Sandnes | Sandnes Idrettspark | 4,969 | Bengt Sæternes |
| Sogndal | Sogndal | Fosshaugane Campus | 5,539 | Eirik Bakke |
| Strømmen | Strømmen | Strømmen Stadion | 1,800 | Gunnar Halle |
| Åsane | Åsane | Åsane Idrettspark | 3,000 | Morten Røssland |
Managerial changes
Table
Season statistics
Top scorers
Source:Most assists
Hat tricks
| Player | For | Against | Result | Date |
| Jakob Orlov | Brann | Ranheim | 4–1 | 30 April 2015 |
| Ohi Omoijuanfo | Jerv | Levanger | 4–2 | 31 May 2015 |
| Kristian Fardal Opseth | Sogndal | Brann | 4–0 | 21 June 2015 |
| Robert Stene | Ranheim | Åsane | 3–2 | 5 July 2015 |
| Geir André Herrem | Åsane | Bærum | 5–0 | 20 September 2015 |