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. 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. Mouat previously won the 2017 Boost National.