2020–21 Danish 1st Division
The 2020–21 Danish 1st Division marked the 25th season of the league operating as the second tier of Danish football and the 81st season overall under the 1st Division name. The league is governed by the Danish Football Association.
From this season a promotion round for the six best placed teams and a relegation round for the six lowest placed teams are introduced. The top two teams of the promotion round are promoted to the 2021–22 Danish Superliga. The teams in 11th and 12th places are relegated to the 2021–22 Danish 2nd Division.
Participants
Silkeborg IF, and Esbjerg fB finished last in the 2019–20 Danish Superliga relegation play-off and were relegated to the 1st Division. Hobro IK lost to Lyngby Boldklub in the relegation play off and was relegated as well. Vejle Boldklub was promoted to the 2020–21 Danish Superliga.Nykøbing FC, FC Roskilde and Næstved BK were relegated to the 2020–21 Danish 2nd Divisions. Nykøbing FC was relegated after four seasons in the league, FC Roskilde after six seasons, and Næstved BK after two seasons. FC Helsingør won promotion from the 2019–20 Danish 2nd Divisions. They won promotion after only one season's absence.
Stadia and locations
| Club | Location | Stadium | Turf | Capacity | 2019–20 position |
| Esbjerg | Blue Water Arena | Natural | 18,000 | ||
| Fredericia | Monjasa Park | Natural | 4,000 | ||
| Helsingør | Helsingør Stadion | Natural | 4,500 | ||
| Copenhagen | Sundby Idrætspark | Artificial | 7,200 | ||
| Herfølge/Køge | Capelli Sport Stadion | Artificial | 4,000 | ||
| Hobro | DS Arena | Natural | 10,700 | ||
| Hvidovre | Hvidovre Stadion Capelli Sport Stadion | Natural Artificial | 12,000 4,000 | ||
| Kolding | Autocentralen Park | Natural | 10,000 | ||
| Silkeborg | JYSK Park | Artificial | 10,000 | ||
| Skive | SPAR Nord Arena | Natural | 10,000 | ||
| Hjørring | Hjørring Stadion | Natural | 7,500 | ||
| Viborg | Energi Viborg Arena | Natural | 9,566 |
Personnel and sponsoring
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players and Managers may hold more than one non-FIFA nationality.| Team | Head coach | Captain | Kit manufacturer | Shirt sponsor | |||
| Esbjerg fB |  Promotion GroupPoints and goals carry over in full from the regular season.Relegation GroupPoints and goals carry over in full from the regular season.Season statisticsTop goalscorers
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