St. Louis Exposition and Music Hall was an indoor exposition hall, Music Hall and arena in St. Louis, Missouri from 1883 to 1907. Three national presidential nominating conventions were held in three separate buildings in or near the complex between 1888 and 1904 including the 1888 Democratic National Convention, 1896 Republican National Convention, and 1904 Democratic National Convention. In addition to the 1904 Democratic convention, it was used as a large venue for other conventions and congresses during the 1904 World's Fair.