The 2018 2. divisjon (referred to as PostNord-ligaen for sponsorship reasons) was a Norwegianfootball third-tier league season. The league consisted of 28 teams divided into 2 groups of 14 teams.
The league was played as a double round-robin tournament, where all teams played 26 matches.
Team changes
The following teams changed division since the 2017 season.
The teams who finished in second place in their respective group qualified for the promotion play-offs, where they faced each other over two legs. The winner, KFUM Oslo, then played against the 14th placed team in 1. divisjon for a place in the 2019 1. divisjon.