The 1900 Republican National Convention was held June 19 to June 21 in the Exposition Auditorium, Philadelphia, Pennsylvania. The Exposition Auditorium was located south of the University of Pennsylvania, and the later Convention Hall was constructed along the building's east wall. It was demolished in 2006.

Marcus Alonzo Hanna was an American businessman and Republican politician who served as a United States Senator from Ohio as well as chairman of the Republican National Committee. A friend and political ally of President William McKinley, Hanna used his wealth and business skills to successfully manage McKinley's presidential campaigns in 1896 and in 1900.