The 2021 season was Hammarby Fotboll's 106th in existence, their 52nd season in Allsvenskan and their 7th consecutive season in the league. They competed in Allsvenskan, Svenska Cupen and Conference League during the year. League play started in April, initially behind closed doors due to the coronavirus pandemic. Stefan Billborn made his fourth season as manager, but was sacked after eight rounds and replaced by Miloà ¡ MilojeviÃÂ.
On 30 May 2021, Hammarby IF won the 2020âÂÂ21 Svenska Cupen, their first title in the main domestic cup, through a 5âÂÂ4 win on penalties (0âÂÂ0 after full-time) against BK Häcken in the final.
On 11 June 2021, Hammarby decided to terminate manager Stefan Billborn's contract, with the club placed 8th in the 2021 Allsvenskan table after eight rounds. On 13 June, Miloà ¡ MilojeviÃÂ, most recently an assistant at Red Star Belgrade, was appointed new head coach.
The side reached the play-off round of the 2021âÂÂ22 UEFA Europa Conference League, after eliminating Maribor (4âÂÂ1 on aggregate) and FK ÃÂukariÃÂki (6âÂÂ4 on aggregate), where it was knocked out by Basel on penalties (4âÂÂ4 on aggregate).
In Allsvenskan, Hammarby finished in 5th place after a stronger second half of the campaign.
|- ! 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
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