This is a list of Danish football transfers for the 2021 summer transfer window. Only moves featuring at least one Danish Superliga club are listed.
The winter transfer window opened on 15 June 2021. The window closed at midnight on 31 August 2021.
In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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In:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Out:Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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The 2016–17 season was FC Midtjylland's 17th consecutive season in the Danish Superliga. Midtjylland participated in the Europa League this season, after finishing 3rd in the 2015–16 Danish Superliga.
The 2020–21 season was AaB's 38th consecutive season in the top flight of Danish football, 31st consecutive season in the Danish Superliga, and 135th year in existence as a football club.
The 2020–21 season, was SønderjyskE's 20th season as a professional football club and their 12th consecutive season in the Superliga, the top-flight of Danish football. In addition to the domestic league, the club is competing in this season's editions of the Danish Cup and UEFA Europa League, which they appeared in for the second time following their win in the 2019–20 Danish Cup. The season covers the period from July 2020 to 30 June 2021.
The 2021–22 season is AaB's 39th consecutive season in the top flight of Danish football, 32nd consecutive season in the Danish Superliga, and 136th year in existence as a football club.
The 2023–24 season is FC Midtjylland's 25th season in existence, and its 23rd consecutive season in the Danish Superliga, the top tier of football in Denmark. As a result of the club's seventh-place finish and playoff win during the 2022–23 Danish Superliga, it participated in the 2023–24 UEFA Europa Conference League and will also compete in the 2023–24 Danish Cup. Midtjylland finished the 2023–24 season on top of the Danish Superliga, earning the club's fourth league title and qualified for the 2024–25 UEFA Champions League.