The 2020 IIHF World Championship would have been hosted by Switzerland from 8 to 24 May 2020, as the IIHF announced on 15 May 2015 in Prague, Czech Republic.
The tournament was cancelled on 21 March 2020 due to the COVID-19 pandemic. IIHF All-Time Teams were selected on the 100-year anniversary of the Ice Hockey World Championships, from the countries that would have participated at the 2020 IIHF World Championship.
The seedings in the preliminary round are based on the 2019 IIHF World Ranking, as of the end of the 2019 IIHF World Championship, using the serpentine system.
16 referees and linesmen were announced on 25 February 2020.
The schedule was announced on 1 August 2019.
<onlyinclude>
There will be a re-seeding after the quarterfinals.
<onlyinclude></onlyinclude>
All times are local (UTC+2).