AIK were the defending champions after winning the title in the previous season.
Djurgårdens IF won the Allsvenskan title, their first since 2005, their 8th overall and their 12th Swedish championship overall, in the 30th and final round on 2 November 2019 by playing a 2–2 tie in their away fixture against IFK Norrköping.
Helsingborg make their return to Allsvenskan after a two-year absence, this will be their 67th season in the top flight.
The play-off spot was taken by AFC Eskilstuna, replacing IF Brommapojkarna.
The team made it back to Allsvenskan after just one season in the second division, having been relegated in 2017.