[1][2] Canada defeated Russia 4–3 to win the gold medal and their 18th world junior hockey championship.

[4] Referees Linesmen Seeds the preliminary round were based on the 2019 tournament's final standings using the serpentine system.

[5] Note:  Kazakhstan was relegated to the 2022 Division I A 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.

[6] To determine this ranking, the following criteria were used in the order presented:[7] GP = Games played; G = Goals; A = Assists; Pts = Points; +/− = Plus–minus; PIM = Penalties In MinutesSource: IIHF[8] (minimum 40% team's total ice time) TOI = Time on ice (minutes:seconds); GA = Goals against; GAA = Goals against average; SA = Shots against; Sv% = Save percentage; SO = ShutoutsSource: IIHF[9] Source: IIHF Source: IIHF The Division I Group A tournament was played in Minsk, Belarus, from 9 to 15 December 2019.

The Division II Group B tournament was played in Gangneung, South Korea, from 27 January to 3 February 2020.