The 2020–21 HockeyAllsvenskan season was the 16th season that the second tier of Swedish ice hockey operated under that name. The series consisted of 14 teams playing a regular season in which each team played each other team four times, twice at home and twice away. This is followed by a series of promotion and relegation tournaments, with the teams finishing first through tenth participating in promotion playoffs, and the teams finishing 13th and 14th forced to requalify to avoid relegation to the Hockeyettan.