The 2003 IIHF World U18 Championships were held in Yaroslavl, Russia.

Note: Matches   Switzerland 13-2  Kazakhstan and  Finland 8–6  Belarus from the preliminary round (on April 13, 2003 and April 14, 2003 respectively) are included as well since these results carry forward Russia beat  United States for the Bronze medal 6–3.

Switzerland and  Kazakhstan are relegated to Division I for the 2004 IIHF World U18 Championships.

The Group A tournament was held between 17 and 23 March 2003 in Tallinn, Estonia and the Group B tournament was held between 5 and 11 March 2003 in Belgrade, Federal Republic of Yugoslavia.

The Group A tournament was held between 5 and 8 March 2003 in Mexico City, Mexico and the Group B tournament was held between 6 and 9 February 2003 in Sarajevo, Bosnia and Herzegovina.