The 2015 1. divisjon (referred to as the OBOS-ligaen for sponsorship reasons) was a Norwegian second-tier football league season.
[1] The first round of the season was played on 6 April 2015 and the season ended with the last round on 1 November 2015.
[2] An agreement with Oslo's housing cooperative OBOS was signed on 15 January 2015, branding the league as OBOS-ligaen until 2021.
[3] In the 2014 1. divisjon, Sandefjord,[4] Tromsø[4] and Mjøndalen[5] won promotion to Tippeligaen, while Alta, HamKam, Tromsdalen and Ull/Kisa were relegated[4] to the 2015 2. divisjon.
Sogndal,[6] Sandnes Ulf[6] and Brann,[5] were relegated from the 2014 Tippeligaen, while Follo, Jerv, Levanger and Åsane were promoted[7] from the 2014 2. divisjon.