| Competition: | 1. divisjon |
| Season: | 2017 |
| Dates: | 2 April – 5 November |
| Winners: | Bodø/Glimt |
| Promoted: | Bodø/Glimt Start Ranheim |
| Relegated: | Fredrikstad Elverum Arendal |
| Matches: | 240 |
| Total Goals: | 736 |
| League Topscorer: | Kristian Fardal Opseth (28 goals) |
| Biggest Away Win: | Strømmen 1–6 Bodø/Glimt |
| Longest Wins: | 5 games Bodø/Glimt |
| Longest Winless: | 11 games Arendal |
| Longest Unbeaten: | 15 games Bodø/Glimt |
| Longest Losses: | 4 games Fredrikstad |
| Average Attendance: | 1,422 4.9% |
| Prevseason: | 2016 |
| Nextseason: | 2018 |
The 2017 1. divisjon (referred to as OBOS-ligaen for sponsorship reasons) was a Norwegian second-tier football league season.
The first round of the season was played on 2 April 2017 and the season concluded with the last round on 5 November 2017.[1]
In the 2016 1. divisjon, Kristiansund and Sandefjord were promoted to the 2017 Eliteserien, while Bryne, Hødd, KFUM Oslo and Raufoss were relegated to the 2017 2. divisjon.
Bodø/Glimt and Start were relegated from the 2016 Tippeligaen, while Tromsdalen, Elverum, Florø and Arendal were promoted from the 2016 2. divisjon.
| Team | Location | Arena | Capacity | Manager |
|---|---|---|---|---|
| Arendal | Arendal | Bjønnes Stadion | 1,500 |  Mattias Andersson |
| Åsane | Åsane | Åsane Idrettspark | 3,000 |  Mons Ivar Mjelde |
| Bodø/Glimt | Bodø | Aspmyra Stadion | 7,354 | Aasmund Bjørkan |
| Elverum | Elverum | Elverum Stadion | 1,400 | Tore Fossum |
| Fredrikstad | Fredrikstad | Fredrikstad Stadion | 12,565 | Bjørn Petter Ingebretsen |
| Florø | Florø | Florø Stadion | 2,800 | Terje Rognsø |
| Jerv | Grimstad | J.J. Ugland Stadion – Levermyr | 1,750 | Arne Sandstø |
| Kongsvinger | Kongsvinger | Gjemselund Stadion | 6,700 | Hans-Erik Eriksen |
| Levanger | Levanger | Moan Fritidspark | 6,000 | Magnus Powell |
| Mjøndalen | Mjøndalen | Isachsen Stadion | 4,350 | Vegard Hansen |
| Ranheim | Trondheim | EXTRA Arena | 3,000 | Svein Maalen |
| Sandnes Ulf | Sandnes | Sandnes Idrettspark | 4,969 | Bengt Sæternes |
| Start | Kristiansand | Sør Arena | 14,563 | Mick Priest |
| Strømmen | Strømmen | Strømmen Stadion | 1,800 | Espen Olsen |
| Tromsdalen | Tromsdalen | Tromsdalen Stadion | 3,000 | Gaute Helstrup |
| Ull/Kisa | Jessheim | UKI Arena | 3,000 | Vegard Skogheim |
| Team | Outgoing manager | Manner of departure | Date of vacancy | Table | Incoming manager | Date of appointment | Table |
|---|---|---|---|---|---|---|---|
| Fredrikstad | Mons Ivar Mjelde | Resigned | 4 November 2016[2] | Pre-season |  Andrea Loberto | 23 November 2016[3] | Pre-season |
| Åsane | Kjetil Knutsen | Contract expired | 1 December 2016 | Mons Ivar Mjelde | 1 December 2016 | ||
| Arendal | Knut Tørum | Sacked | 12 June 2017 | 16th | Mattias Andersson | 12 June 2017 | 16th |
| Start | Steinar Pedersen | Sacked | 29 September 2017[4] | 2nd | Mick Priest (interim) | 29 September 2017 | 2nd |
| Fredrikstad | Andrea Loberto | Resigned | 27 October 2017[5] | 14th | Aleksander Olsen (interim) | 27 October 2017 | 14th |
| Fredrikstad | Aleksander Olsen | End of caretaker spell | 29 October 2017[6] | 15th | Bjørn Petter Ingebretsen | 29 October 2017 | 15th |
See main article: 2017 Eliteserien promotion/relegation play-offs. The third to sixth-placed teams took part in the promotion play-offs; these were single leg knockout matches, two semi-finals and a final. The winners, Ranheim, 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 took part in a two-legged play-off against Notodden, the winners of the 2. divisjon play-offs, to decide who would play in the 2018 OBOS-ligaen.
Notodden won 5–3 on aggregate.
| Rank | Player | Club | Goals | Games | Average |
|---|---|---|---|---|---|
| 1 | Kristian Fardal Opseth | Bodø/Glimt | 28 | 30 | 0,93 |
| 2 | Amahl Pellegrino | Mjøndalen | 18 | 29 | 0,62 |
| 3 | Robert Stene | Levanger | 15 | 28 | 0,54 |
| Kent Håvard Eriksen | Sandnes Ulf | 15 | 30 | 0,50 | |
| 5 | Endre Kupen | Florø | 14 | 23 | 0,61 |
 Ousseynou Boye | Mjøndalen | 14 | 25 | 0,56 | |
| 7 | Ulrik Saltnes | Bodø/Glimt | 13 | 27 | 0,48 |
| 8 | Niklas Castro | Kongsvinger | 12 | 25 | 0,48 |
| Kristoffer Ødemarksbakken | Ullensaker/Kisa | 12 | 29 | 0,41 | |
| 10 | Niklas Sandberg | Ullensaker/Kisa | 11 | 26 | 0,42 |
| Geir André Herrem | Åsane | 11 | 27 | 0,41 | |
| Nicolay Solberg | Ullensaker/Kisa | 11 | 27 | 0,41 | |
| Kjell Rune Sellin | Sandnes Ulf | 11 | 29 | 0,38 | |
 Sanel Kapidzic | Fredrikstad | 11 | 29 | 0,38 | |
| 15 | Steffen Lie Skålevik | Start | 10 | 11 | 0,91 |
| Adem Güven | Kongsvinger | 10 | 24 | 0,42 | |
| Trond Olsen | Bodø/Glimt | 10 | 27 | 0,37 | |
| Mads Reginiussen | Ranheim | 10 | 29 | 0,34 |