The 2021 Marsh One-Day Cup was the 52nd season of the official List A domestic cricket competition being played in Australia.

[3] On 16 December 2020, Cricket Australia confirmed the schedule of the tournament,[4] with the final scheduled to be played on 30 April 2021, the latest finish to a domestic cricket season in Australia.

[5] On 10 February 2021, Cricket Australia announced the reduction of the tournament from 22 to 16 matches due to concerns over bubble fatigue,[6] which resulted in a full schedule change.

[7] New South Wales won the tournament, after they beat Western Australia by 102 runs in the final.

Fox Cricket broadcast 12 matches, including the final.