The 2020 season was Hammarby Fotboll's 105th in existence, their 51st season in Allsvenskan and their 6th consecutive season in the league. They competed in Allsvenskan, Svenska Cupen and Europa League during the year. League play was planned to start in early April, but was postponed until June due to concerns over the coronavirus pandemic. Stefan Billborn made his third season as manager.
In a season postponed due to the COVID-19 pandemic, the side disappointedly finished 8th in the Allsvenskan table. The club won 3âÂÂ0 against Puskás Akadémia in the first round of the 2020âÂÂ21 UEFA Europa League, but was eliminated from the tournament in the second round against Lech Poznaà  through a 0âÂÂ3 loss.
|- ! colspan=12 style=background:#DCDCDC; text-align:center| Goalkeepers
|- ! colspan=12 style=background:#DCDCDC; text-align:center| Defenders
|- ! colspan=12 style=background:#DCDCDC; text-align:center| Midfielders
|- ! colspan=12 style=background:#DCDCDC; text-align:center| Forwards
|- ! colspan="18" style="background:#dcdcdc; text-align:center"| Players transferred/loaned out during the season