Lacrosse at the Summer Olympics has been contested at two editions of the Summer Olympic Games — 1904 and 1908. Both times it had been open only to men; both times a Canadian team had won the competition. In its first year, three teams from two nations competed. The second appearance saw only two teams, again from two nations, compete.
Every team that has played lacrosse has won a medal. Canada has won three of the five medals, by virtue of having had three of the five competing teams.