The 2021 Humpty's Champions Cup, a curling Grand Slam event, was held April 15–19, 2021 at the Markin MacPhail Centre at Canada Olympic Park in Calgary, Alberta.

Two days before the event was supposed to begin on Monday, April 12, the organizers delayed its start time by one day due to the (false) positive COVID-19 tests from the 2021 World Men's Curling Championship, which was held at the same site from April 2–11.

The event utilized the "no tick rule", an experimental rule in which any guard rock touching the centre line may not be moved off of the centre line by an opposing stone until the sixth rock of the end.

[4] On the men's side, Bruce Mouat of Scotland won his second career Grand Slam by defeating Team Brendan Bottcher 6–3 in the final.

[5] On the women's side, Rachel Homan of Ottawa also won 6–3 in the final, doubling up on Team Silvana Tirinzoni of Switzerland.