The 2023 IIHF U20 World Championship Division I was a pair of international under-20 ice hockey tournaments organized by the International Ice Hockey Federation.

For each tier's tournament, the first-placed team was promoted to a higher division, while the last-placed team was relegated to a lower division.

The Division I A tournament was played in Asker, Norway, from 11 to 17 December 2022.

GP = Games played; G = Goals; A = Assists; Pts = Points; +/− = P Plus–minus; PIM = Penalties In Minutes Source: IIHF (minimum 40% team's total ice time) TOI = Time on ice (minutes:seconds); GA = Goals against; GAA = Goals against average; Sv% = Save percentage; SO = Shutouts Source: IIHF Source: IIHF The Division I B tournament was played in Bytom, Poland, from 11 to 17 December 2022.

GP = Games played; G = Goals; A = Assists; Pts = Points; +/− = P Plus–minus; PIM = Penalties In Minutes Source: IIHF (minimum 40% team's total ice time) TOI = Time on ice (minutes:seconds); GA = Goals against; GAA = Goals against average; Sv% = Save percentage; SO = Shutouts Source: IIHF Source: IIHF