The 2020 Superettan was part of the 2020 Swedish football season, and the 21st season of Superettan, Sweden's second-tier football division in its current format.
The top two teams qualify directly for promotion to Allsvenskan, the third will enter a play-off for the chance of promotion.
The 13th-placed and 14th-placed teams of Superettan met the two runners-up from 2020 Division 1 (Norra and Södra) in two-legged ties on a home-and-away basis with the teams from Superettan finishing at home.
Landskrona BoIS won 3–1 on aggregate.
Trelleborgs FF won 4–1 on penalties.