2021 IIHF Women's World Championship

The 2021 IIHF Women's World Championship was an international Ice hockey tournament run by the International Ice Hockey Federation.

Delay, Postponing, and Rescheduled
It was originally to be contested in Halifax and Truro, Nova Scotia, Canada from 7 to 17 April 2021. It was later pushed back to 6 to 16 May 2021. It was cancelled in Nova Scotia on 21 April 2021, with the IIHF and Hockey Canada looking for a new host for summer 2021. On 30 April 2021, the IIHF announced that the tournament will now take place between 20 and 31 August 2021, with a venue still to be determined.

On 30 April 2021, the IIHF announced that the tournament would now take place between 20 and 31 August 2021. On 2 June 2021, the venue was identified as WinSport Arenas at Canada Olympic Park in Calgary, Alberta.

All divisions stayed put after all events last year were cancelled due to the COVID-19 pandemic.

Participants

 * – Promoted from Division I A
 * – Promoted from Division I A
 * – Promoted from Division I A
 * – Promoted from Division I A
 * – Promoted from Division I A
 * – Promoted from Division I A

Rosters
Each team's roster consists of at least 15 skaters (forwards, and defencemen) and two goaltenders, and at most 20 skaters and three goaltenders. All ten participating nations, through the confirmation of their respective national associations, had to submit a "Long List" roster no later than two weeks before the tournament.

Match officials
Twelve referees and ten linesmen are selected for the tournament.

Preliminary round
All times are local (UTC−6).

Bracket
There was a re-seeding after the quarterfinals.