The 2021 Icelandic Cup, also known as Mjólkurbikarinn for sponsorship reasons, was the 62nd edition of the Icelandic national football cup.
64 clubs competed in the first round. The matches were played from 22 to 26 April 2021.
|colspan="3" style="background-color:#97DEFF"|22 April 2021
|- |colspan="3" style="background-color:#97DEFF"|23 April 2021
|- |colspan="3" style="background-color:#97DEFF"|24 April 2021
|- |colspan="3" style="background-color:#97DEFF"|25 April 2021
|- |colspan="3" style="background-color:#97DEFF"|26 April 2021
A total of 40 teams competed in the second round. Ties were played from 30 AprilâÂÂ2 May.
|colspan="3" style="background-color:#97DEFF"|30 April 2021
|- |colspan="3" style="background-color:#97DEFF"|1 May 2021
|- |colspan="3" style="background-color:#97DEFF"|2 May 2021
A total of 32 teams competed in this round of the competition, with the clubs from the ÃÂrvalsdeild entering at this stage. Ties were played from 22 to 24 June.
|colspan="3" style="background-color:#97DEFF"|22 June 2021
|- |colspan="3" style="background-color:#97DEFF"|23 June 2021
|- |colspan="3" style="background-color:#97DEFF"|24 June 2021
A total of sixteen teams competed in the fourth round, with matches played on 26, 27 and 28 June.
|colspan="3" style="background-color:#97DEFF"|10 August 2021
|- |colspan="3" style="background-color:#97DEFF"|11 August 2021
|- |colspan="3" style="background-color:#97DEFF"|12 August 2021
A total of eight teams competed in the quarter-finals, with matches played on 15 September.
|colspan="3" style="background-color:#97DEFF"|15 September 2021
A total of four teams were competed in the semi-finals, with matches played on 2 October.
|colspan="3" style="background-color:#97DEFF"|2 October 2021