Malmö FF were the defending champions after winning the title in the previous season.
Halmstads BK and AFC Eskilstuna were relegated at the end of the 2017 season after finishing in the bottom two places of the table.
IF Brommapojkarna returned to Allsvenskan after three years' absence, having been relegated at the end of the 2014 season.
The final spot was taken by the 2017 Allsvenskan play-offs winner; Trelleborgs FF, third-placed team in 2017 Superettan, who replace Jönköpings Södra IF.
Hammarby IF drew the highest average home attendance in the 2018 edition of the Swedish top-flight football league.