The 2009 IIHF World U18 Championship Division III was an international under-18 ice hockey competition organised by the International Ice Hockey Federation.

Both Division III tournaments made up the fourth level of competition of the 2009 IIHF World U18 Championships.

Australia and Iceland won the Group A and B tournaments respectively and gained promotion to Division II of the 2010 IIHF World U18 Championships.

The Group A tournament was played in Taipei, Taiwan at Annex Ice Rink from 27 February to 5 March 2009.

The Group B tournament was played in Erzurum, Turkey at GSIM Yenişehir Ice Hockey Hall from 9 to 15 March 2009.