| Season | 2005 |
|---|---|
| Dates | 10 April – 30 October |
| Champions | Stabæk |
| Promoted | Stabæk Sandefjord |
| Relegated | Mandalskameratene Skeid Tønsberg Alta |
| Matches played | 240 |
| Goals scored | 731 (3.05 per match) |
| Top goalscorer | Daniel Nannskog (27 goals) |
| Biggest home win | Stabæk 8–1 Pors Grenland[1] (30 October 2005) |
| Biggest away win | Alta 0–5 Løv-Ham[1] (30 October 2005) |
| Highest scoring | Tønsberg 3–6 Pors Grenland[1] (13 August 2005) |
← 2004 2006 → | |
The 2005 1. divisjon (referred to as Adeccoligaen for sponsorship reasons) was a Norwegian second-tier football season. The season kicked off on 10 April 2005, and the final round was played on 30 October 2005.
Stabæk were promoted to the 2006 Tippeligaen as First Division winners, along with Sandefjord who finished second. Sandefjord will be playing in the top division for the first time while Stabæk return to Tippeligaen after being relegated in 2004.
As in previous years, there was a two-legged promotion playoff at the end of the season, between the third-placed team in the 1. divisjon (Moss) and the twelfth-placed team in the Tippeligaen (Molde). Molde kept their spot in the Tippeligaen, after beating Moss 5–2 on aggregate.
Mandalskameratene, Skeid, Tønsberg and Alta were relegated to the 2006 2. divisjon at the end of the season.