The 2015 World Junior Ice Hockey Championship Division I was played in two groups of six teams each. In each group the first-placed team is promoted to a higher level, while the last-placed team is relegated to a lower level. The winners of Division I B, Kazakhstan, were promoted to the 2016 Division I A and the winners of Division I A, Belarus, were promoted to the 2016 top division. Divisions I A and I B represent the second and the third tier of the IIHF World U20 Championship.