2020 World Junior Ice Hockey Championships

The 2020 Ice Hockey World Junior Championships ("2020 WJC") was the 44th edition of the Ice Hockey World Junior Championship. It began on December 26, 2019, and ended with the gold medal game being played on January 5, 2020. Canada defeated Russia 4–3 to win the gold medal and their 18th world junior hockey championship. This marks the fourth time that the Czech Republic hosted the WJHC.
On April 16, 2018, it was announced that Ostrava and Třinec, in the Moravian-Silesian Region in the northeast corner of the Czech Republic, would be the host cities. It is the second time that Ostrava has been the primary host of the tournament and the first time that Třinec is hosting in any capacity. Ostrava has also twice co-hosted the senior Ice Hockey World Championships.
Top Division.
Officials.
The following officials were assigned by the International Ice Hockey Federation to officiate the 2019 World Junior Championships.
Referees
Linesmen
Seeding.
The seedings in the preliminary round are based on the 2019 tournament's final standings using the serpentine system. On 6 January 2019, the IIHF announced the groups. With Germany being promoted from Division I A after winning the 2019 Division I A Tournament. 
Format.
The preliminary round is a two group of five teams each internal round-robin format, followed by a three-round playoff. In the round-robin, three points are allotted for a regulation win, and two points for an overtime or shootout win. One point is allotted for an overtime or shootout loss.
The four highest-ranked teams from each group of the preliminary round advance to the quarterfinals while the last-place team from each group will play a best-of-three series, the loser relegated to Division IA for 2021, being replaced by the winner of Division IA. All other teams will retain their Top Division status for the 2021 edition.
Playoff round.
Winning teams were reseeded for the semi-finals in accordance with the following ranking, this was a change the IIHF implemented during their 2019 annual congress. To determine this ranking, the following criteria were used in the order presented:
Division I.
Group A.
The tournament was held in Minsk, Belarus from 9 to 15 December 2019.
Group B.
The tournament was held in Kyiv, Ukraine from 12 to 18 December 2019.
Division II.
Group A.
The tournament was held in Vilnius, Lithuania from 6 to 12 January 2020.
Group B.
The tournament was held in Gangneung, South Korea from 28 January to 3 February 2020.
Division III.
The tournament was held in Sofia, Bulgaria from 13 to 19 January 2020.