City Museum is a museum whose exhibits consist largely of repurposed architectural and industrial objects, housed in the former International Shoe building in the Washington Avenue Loft District of St. Louis, Missouri, United States. Opened in October 1997, the museum attracted more than 700,000 visitors in 2010.

Robert James Cassilly Jr. was an American sculptor, entrepreneur, and creative director based in St. Louis, Missouri. In 1997, Cassilly founded the idiosyncratic City Museum, which draws over 700,000 visitors a year and is one of the city's leading tourist attractions.