The 2018 1. divisjon was the second tier of Norwegian women's football in 2018.
The season kicked off on 14 April 2018, finishing on 3 November 2018.
The top placed team was promoted to next year's Toppserien.
The second placed team contested a playoff against the 11th placed team from the 2018 Toppserien for the right to play in Toppserien next season.
Urædd – Relegated 12.