The 2023 Icelandic Cup, also known as Mjólkurbikarinn for sponsorship reasons, was the 64th edition of the Icelandic national football cup. The winners qualified for the 2024–25 Conference League first qualifying round.
Víkingur Reykjavík were the defending cup holders for the third consecutive season, and retained the cup on 16 September 2023 with a 3–1 win over KA. Since they qualified for the Conference League based on league position, the Conference League spot for winning the cup was passed to the fourth-placed team in the 2023 Besta deild karla.
First round
50 clubs competed in the first round.
|colspan="3" style="background-color:#97DEFF"|22 March 2023
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|colspan="3" style="background-color:#97DEFF"|30 March 2023
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|colspan="3" style="background-color:#97DEFF"|31 March 2023
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|colspan="3" style="background-color:#97DEFF"|1 April 2023
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|colspan="3" style="background-color:#97DEFF"|2 April 2023
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Second round
A total of 40 teams competed in the second round.
|colspan="3" style="background-color:#97DEFF"|6 April 2023
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|colspan="3" style="background-color:#97DEFF"|8 April 2023
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|colspan="3" style="background-color:#97DEFF"|11 April 2023
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Third round
The 20 second round winners and 12 teams in Tier 1 entered the third round. Ties were played from 19 to 20 April.
|colspan="3" style="background-color:#97DEFF"|19 April 2023
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|colspan="3" style="background-color:#97DEFF"|20 April 2023
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Fourth round
The 16 Round of 32 winners competed in the fourth round.
|colspan="3" style="background-color:#97DEFF"|16 May 2023
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|colspan="3" style="background-color:#97DEFF"|17 May 2023
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|colspan="3" style="background-color:#97DEFF"|18 May 2023
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Quarter-finals
The eight Round of 16 winners competed in the quarter-finals.
|colspan="3" style="background-color:#97DEFF"|5 June 2023
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|colspan="3" style="background-color:#97DEFF"|6 June 2023
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Semi-finals
The four quarter-final winners competed in the semi-finals.