| 2021 Knock on Effect New South Wales Cup | |
|---|---|
| Duration | 12 March – 26 September 2021 |
| Teams | 11 |
| Broadcast partners | Fox League |
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.[1]