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Tournaments

World Lacrosse sponsors five world championship tournaments: the World Lacrosse Championship for men's field, the Women's Lacrosse World Championship for women's, the World Indoor Lacrosse Championship for box lacrosse, as well as the Men's Under-20 World Lacrosse Championships and Women's Under-20 World Lacrosse Championships. Each is held every four years.

The World Lacrosse Championship (WLC) began in 1968 as a four-team invitational tournament sponsored by the International Lacrosse Federation. Until 1990, only the United States, Canada, England, and Australia had entered. With the expansion of the game internationally, the 2014 World Lacrosse Championship was contested by 38 countries. The WLC has been dominated by the United States. Team USA has won 11 of the 14 titles, with Canada winning the other three.

The Women's Lacrosse World Cup (WLWC) began in 1982. The United States has won 9 of the 11 titles, with Australia winning the other two. Canada and England have always finished in the top five. The 2017 tournament was held in England and featured 25 countries.

The first World Indoor Lacrosse Championship (WILC) was held in 2003 and contested by six nations at four sites in Ontario. Canada won the championship by beating the Iroquois Nationals 21–4 in the final. The 2007 championship hosted by the Onondaga Nation included 13 teams. Canada has dominated the competition, winning all five gold medals and never losing a game.

The Iroquois Nationals are the men's national team representing the Six Nations of the Iroquois Confederacy in international field lacrosse competition. The team was admitted to the FIL in 1987. It is the only First Nations team sanctioned for international competition in any sport. The Nationals placed fourth in the 1998, 2002 and 2006 World Lacrosse Championships and third in 2014. The indoor team won the silver medal in all four World Indoor Lacrosse Championships. In 2008, the Iroquois women's team was admitted to the FIL as the Haudenosaunee Nationals. They placed 7th at the 2013 Women's Lacrosse World Cup.