2018 Norwegian Second Division

The 2018 2. divisjon (referred to as PostNord-ligaen for sponsorship reasons) was a Norwegian football 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.

To 2. divisjon
Promoted from 3. divisjon
 * Moss
 * Stabæk 2
 * Fløy
 * Brattvåg
 * Stjørdals-Blink
 * Mjølner

Relegated from 1. divisjon
 * Fredrikstad
 * Elverum
 * Arendal

From 2. divisjon
Promoted to 1. divisjon
 * HamKam
 * Nest-Sotra
 * Notodden

Relegated to 3. divisjon
 * Finnsnes
 * Brumunddal
 * Follo
 * Vindbjart
 * Fana
 * Byåsen

Promotion play-offs
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.

KFUM Oslo won 4–1 on aggregate.