The 2020–21 NWHL season was the sixth season of the National Women's Hockey League in North America. Due to the ongoing COVID-19 pandemic, the season was held in a bubble in Lake Placid, New York, from January to February 2021, with all five teams returning from the previous season, along with the Toronto Six expansion team as the first Canada-based team to play in the league. The season was suspended again due to positive cases of COVID-19 within the bubble. On March 8, 2021, the league announced that the Isobel Cup playoffs would re-commence on March 26 and 27 at Warrior Ice Arena in Brighton, Massachusetts.

The Premier Hockey Federation (PHF) was a women's professional ice hockey league in the United States and Canada that operated from March 2015 until June 2023. The league was established in 2015 as the National Women's Hockey League (NWHL), comprising four league-owned teams. Over time, some teams gained independent ownership and the number of teams grew to seven; teams during the league's final season in 2022–23 included the Boston Pride, Buffalo Beauts, Connecticut Whale, Metropolitan Riveters, Minnesota Whitecaps, Montreal Force, and Toronto Six. The Isobel Cup was awarded annually to the league playoff champion.