The men's tournament of water polo at the 2011 Pan American Games in Guadalajara, Mexico took place from October 23 to October 29, when the United States defeated Canada 7–3 for the gold medal. All games were held at the Scotiabank Aquatics Center. The defending champions are the United States. The winner of the competition has qualified directly for the 2012 Summer Olympics in London, Great Britain, while the second through fourth-place finishing teams have qualified for the 2012 Men's Water Polo Olympic Games Qualification Tournament that was held in Edmonton, Canada.