| Competition: | 2. divisjon |
| Season: | 2018 |
| Winners: | Raufoss (Group 1) Skeid (Group 2) |
| Promoted: | Raufoss Skeid KFUM Oslo |
| Relegated: | Nybergsund Hønefoss Stabæk 2 Fløy Vålerenga 2 Vard Haugesund |
| Matches: | 364 |
| Total Goals: | 1195 |
| League Topscorer: | Jonas Enkerud (21 goals) |
| Prevseason: | 2017 |
| Nextseason: | 2019 |
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.
The following teams changed division since the 2017 season.
Promoted from 3. divisjon
Relegated from 1. divisjon
Promoted to 1. divisjon
Relegated to 3. divisjon
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.
| Rank | Player | Club | Goals[1] |
|---|---|---|---|
| 1 |  Jonas Enkerud | Elverum | 21 |
| 2 | Kristoffer Hoven | Hønefoss | 19 |
 Anton Henningsson | Raufoss | ||
| 4 | Marcus Mehnert | Asker | 15 |
| 5 | Oscar Aga | Stabæk 2 | 14 |
| Tobias Lauritsen | Odd 2 | ||
| 7 | Tim Nilsen | Fredrikstad | 13 |
| 8 | Mahmoud Sami Laham | Fram Larvik | 12 |
| 9 | Vegard Braaten | Alta | 11 |
| Georg Flatgård | Elverum | ||
| Oskar Johannes Løken | Raufoss |
| Rank | Player | Club | Goals[2] |
|---|---|---|---|
| 1 | David Tavakoli | Skeid | 17 |
| 2 | Mesut Can | Skeid | 16 |
| Omar Fonstad el Ghaouti | Bryne | ||
| 4 | Walid Idrissi | Kjelsås | 15 |
| 5 | Bubacarr Sumareh | Egersund | 14 |
| 6 | Markus Naglestad | Hødd | 13 |
| Moses Mawa | KFUM Oslo | ||
| Sander Werni | Vålerenga 2 | ||
| 9 | Håkon Leine | Brattvåg | 10 |
| Sondre Hopmark Stokke | Stjørdals-Blink |