The 2015 IIHF U18 World Championship Division I was two international under-18 ice hockey tournaments organised by the International Ice Hockey Federation.

The Division I A and Division I B tournaments represent the second and the third tier of the IIHF World U18 Championship.

The Division I A tournament was played in Debrecen, Hungary, from 12 to 18 April 2015.

(Central European Summer Time – UTC+2) GP = Games played; G = Goals; A = Assists; Pts = Points; +/− = P Plus–minus; PIM = Penalties In Minutes Source: IIHF.com (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.com The Division I B tournament was played in Maribor, Slovenia, from 12 to 18 April 2015.

(Central European Summer Time – UTC+2) GP = Games played; G = Goals; A = Assists; Pts = Points; +/− = P Plus–minus; PIM = Penalties In Minutes Source: IIHF.com (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.com