2020 Lillestrøm SK season

The 2020 campaign was Lillestrøm's 103rd competitive season since the club were founded.

Season events
On 12 June, the Norwegian Football Federation announced that a maximum of 200 home fans would be allowed to attend the upcoming seasons matches.

On 10 September, the Norwegian Football Federation cancelled the 2020 Norwegian Cup due to the COVID-19 pandemic in Norway.

On 30 September, the Minister of Culture and Gender Equality, Abid Raja, announced that clubs would be able to have crowds of 600 at games from 12 October.

Winter
In:

Out:

Summer
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Out: