The 2012 IIHF U18 World Championship Division I was two international under-18 ice hockey tournaments organised by the International Ice Hockey Federation.

In 2012, a new format was introduced to the IIHF World U18 Championships, therefore Division I A and Division I B now represent the second and the third tier of the IIHF World U18 Championships.

The Division I A tournament was played in Piešťany, Slovakia, from 11 to 17 April 2012.

(Central European Summer Time – UTC+2) The Division I B tournament was played in Székesfehérvár, Hungary, from 11 to 17 April 2012.

(Central European Summer Time – UTC+2)