The Carson Mansion is a large Victorian house located in Old Town, Eureka, California. Regarded as one of the premier examples of Queen Anne style architecture in the United States, the house is "considered the most grand Victorian home in America." It is one of the most written about and photographed Victorian houses in California and possibly also in the United States.

Old Town Eureka in Eureka, California, is a historic district listed on the United States National Register of Historic Places. It is a 350-acre (1.4 km2) area containing 154 buildings mostly from the Victorian era. The core of the district runs the length of First, Second, and Third Streets, between "C" and "M" Streets, and includes many types of architecture including Eastlake, Queen Ann, Greek Revival, Classical Revival, and Second Empire styles from the 1850s to the 20th century. Though not officially within the district, the Carson Mansion commands the highest elevation at the eastern edge of the district.