2006 Warrior World Lacrosse Championship, held in London, Ontario from 13–22 July 2006, was won by Canada and featured a record twenty-one competing nations. The championship game was won 15–10 by the Canadians over the United States in front of 7,735 fans and marked only the second loss by the Americans since the championship were founded in 1967, after Canada's historic 17–16 overtime win in the 1978 final at Edgeley Park, . Canadian Geoff Snider was rewarded for a sensational championships with tournament MVP honours.
This would prove to be the last World Lacrosse Championship to be sanctioned by the International Lacrosse Federation. In August 2008, the ILF merged with the former governing body for women's lacrosse, the International Federation of Women's Lacrosse Associations, to form the Federation of International Lacrosse. Future World Championships will be sanctioned by FIL, the next of which is the 2010 World Lacrosse Championship, in Manchester, England.
For the round-robin phase of the tournament, nations were separated into blue, red, orange and yellow divisions according to strength. Each of the twenty-one nations was eligible to win the championship.
Blue division featured the six strongest lacrosse nations: Australia, Canada, England, Iroquois Nationals, Japan, and United States. Results were as follows: