The World Lacrosse Men's U20 Championship, formerly known as the World Lacrosse Men's U19 Championship, are held every four years to award world championships for the under-20 age group in men's lacrosse.

The 2008 men's championship was held in July 2008 in Coquitlam, British Columbia, Canada and was won by the United States.

The 2012 men's tournament was held in Turku, Finland, with the United States winning the title, defeating Canada 10–8, despite a pair of pool-play losses to Canada and the Iroquois Nationals (now Haudenosaunee Nationals).

The 2016 championship for men was held July 7–16, 2016, again in Coquitlam, British Columbia, just outside Vancouver.

The U.S. won its eighth title, coming back from being down 6–0 to eventually defeat Canada 13–12.