The IIHF U18 World Championship is an annual event organized by the International Ice Hockey Federation for national under-18 ice hockey teams from around the world. The tournament is usually played in April and is organized according to a system similar to the Ice Hockey World Championships and the IIHF World U20 Championship (World Junior Ice Hockey Championship).
|Current season, competition or edition:|
2021 IIHF World U18 Championships
|No. of teams||10|
|Canada (4th title)|
|Most titles|| United States |
|Relegation to||Division I|
The United States leads the tournament with ten championships followed by Finland and Canada with four championships, and Russia with three and Sweden with one.  Players who do not participate in the World Championship due to their respective league postseasons have the alternative of representing their country in the Hlinka Gretzky Cup in August.
- (#) Number of tournaments (or 2nd placed/3rd places) won at the time.
- Canadian Press (12 August 2006). "Canada blanks U.S. to win under-18 gold". tsn.ca. Archived from the original on 26 August 2006. Retrieved 12 August 2006.
- "2016 IIHF Calendar of Events" (PDF). Archived from [June 2016 the original] Check
|url=value (help) on 6 June 2016. Retrieved 28 June 2016.
- Adam Steiss (13 March 2020). "IIHF cancels U18 Worlds" (Press release). Plymouth Charter Township, Michigan & Ann Arbor, Michigan, United States: International Ice Hockey Federation.