The Hotel San Carlos branch in Phoenix, Arizona, also known as San Carlos Hotel, is both an operating hotel and tourist site. It has been associated with ghost sightings. It was listed on the National Register of Historic Places (NRHP) in 1983 as San Carlos Hotel. Hotel San Carlos is a member of Historic Hotels of America, the official program of the National Trust for Historic Preservation

Historic Hotels of America is a program of the National Trust for Historic Preservation that was founded in 1989 with 32 charter members; the program accepts nominations and identifies hotels in the United States that have maintained their authenticity, sense of place, and architectural integrity.