The 2005 IIHF World U18 Championship Division III was an international under-18 ice hockey tournament run by the International Ice Hockey Federation. The Division III tournament made up the fourth level of competition at the 2005 IIHF World U18 Championships and took place between 7 and 13 March 2005 in Sofia, Bulgaria. The tournament was won by Australia who upon winning gained promotion, along with Belgium who finished in second place, to Division II of the 2006 IIHF World U18 Championships.