The Royal Ontario Museum (ROM) in Toronto, Ontario, Canada, is a major institution for art, world cultures and natural history with a long institutional history. The museum was founded in 1912 and opened to the public shortly thereafter. The original building dates from the early 20th century and was designed by established Canadian architects; throughout the 20th and 21st centuries the facility has been expanded and updated several times to accommodate growing collections and evolving exhibition concepts. The ROM maintains a close relationship with the University of Toronto and combines public displays with significant research, collection care and educational activities. Its institutional scope connects museum presentation with scholarly research in areas such as paleontology, mineralogy, zoology, botany, archaeology, ethnology and art history. The museum’s collections include both art and material culture objects and extensive natural history holdings. These holdings are diverse and significant, with important holdings relating to ancient Egypt and the Near East, Asian art, Indigenous cultures of the Americas and comprehensive natural history collections including fossils and mineral specimens. In 2007 the museum opened a prominent contemporary architectural addition designed by an internationally known architectural firm; that addition prompted public and professional discussion about heritage integration, urban context and museum architecture. Over decades the ROM has expanded its exhibition program, research infrastructure and collections management. The institution conducts research and conservation, publishes scholarly work and collaborates with national and international partners. The museum is operated by a governing organization that curates, preserves and makes its collections accessible; it is active in teaching, research and public engagement. The collections serve exhibition purposes as well as scientific study and the preservation of cultural and natural materials. Institutional records, catalogues and publications of the ROM, together with reference works, provide more detailed information about specific collection areas, exhibition histories and stages of institutional development.