The 2021 Danmark Rundt (officially PostNord Danmark Rundt 2021 for sponsorship reasons) was a men's road bicycle race which was held from 10 to 14 August 2021.

It was the 30th edition of Danmark Rundt, which was rated as a 2.Pro event on the 2021 UCI Europe Tour and the 2021 UCI ProSeries calendars.

[2] This edition was the race's first in the UCI ProSeries; the 2020 edition was expected to feature in the inaugural UCI ProSeries but was cancelled due to the COVID-19 pandemic.

[3] The race was made up of five stages over five days and concluded with an individual time trial in the traditional finishing town of Frederiksberg.

[1] Six UCI WorldTeams, seven UCI ProTeams, five UCI Continental teams and the Danish national team (competing as Team Postnord Danmark) made up the nineteen teams that participated in the race.