The 2017–18 HockeyAllsvenskan season is the 13th season that the second tier of Swedish ice hockey has operated under that name. The series consists of 14 teams playing a regular season in which each team plays 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 eight participating in promotion playoffs, and the teams finishing 13th and 14th forced to requalify to avoid relegation to the Hockeyettan.