The 2020 Toppserien was the 37th season of the highest women's football league in Norway.
The season was to start initially on 21 March 2020 but due to the effects of the COVID-19 pandemic, it was delayed.
Vålerenga won their first Toppserien title on goal difference after finishing second the previous season.
The league's ninth placed team, Kolbotn, faced Medkila, the 2020 1. divisjon runners-up, in a two-legged play-off to decide who will play in the 2021 Toppserien.
Kolbotn won 6–2 on aggregate and both teams remained in their respective leagues.