The 2017 2. divisjon (referred to as PostNord-ligaen for sponsorship reasons) was a Norwegian football third-tier league.
The league was played as a double round-robin tournament, where all teams played 26 matches.
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 will play against the 14th placed team in 1. divisjon for a place in the 2018 1. divisjon.
Notodden won 5–4 on penalties.