2021 NSW Cup season

The 2021 season of the Knock on Effect New South Wales Cup was curtailed due to lockdowns introduced to combat the Delta variant of the COVID-19 pandemic in New South Wales. Fifteen of a scheduled 24 rounds were played, with the last completed round of matches occurring on the weekend of 19–20 June 2021.

Teams
There were 11 teams in 2021.

Ladder
The table below reflects the competition ladder at the completion of Round 15. This was the last completed round played, and occurred on the weekend of 19–20 June 2021. During July and early August 2021, when there was a hope that the competition could be resumed in late August and September, scheduled matches were cancelled, with the result recorded as a nil-all draw. A Round 2 match between Blacktown Workers Sea Eagles and South Sydney Rabbitohs was postponed due to wet weather. As the rescheduled date was 28 July 2021 this match was not played.

Ladder progression

 * Numbers highlighted in green indicate that the team finished the round inside the top 8.
 * Numbers highlighted in blue indicates the team finished first on the ladder in that round.
 * Numbers highlighted in red indicates the team finished last place on the ladder in that round.
 * Underlined numbers indicate that the team had a bye during that round.