Canada competed at the 1904 Summer Olympics in St. Louis, United States. These Games were the second at which Canadian athletes participated. As in 1900 they did not compete under the Canadian flag, national teams not being introduced until the next Olympics. Unofficially, however, it was a very successful Olympics for Canada with Canadian competitors winning the fourth most medals. However, this was largely because most Europeans decided not to make the long trip to compete in the games. The Canadian athletes were a unified group for the first time and were unofficially regarded as a team.

The 1904 Summer Olympics were an international multi-sport event held in St. Louis, Missouri, United States, from 29 August to 3 September 1904, as part of an extended sports program lasting from 1 July to 23 November 1904, located at what is now known as Francis Olympic Field on the campus of Washington University in St. Louis. The 1904 Summer Olympics were the first time the Olympic Games were held outside Europe.