2015 Norwegian First Division

The 2015 1. divisjon (referred to as the OBOS-ligaen for sponsorship reasons) 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.

2015 Norwegian First Division

The 2015 1. divisjon (referred to as the OBOS-ligaen for sponsorship reasons) 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.