The Sovereign Hotel was a Portland, Oregon, hotel built in 1923. The nine-story building was added to the United States' National Register of Historic Places on December 2, 1981. Part of the building houses a portion of the Oregon Historical Society's Oregon History Center.

The Oregon Historical Society (OHS) is an organization that encourages and promotes the study and understanding of the history of the Oregon Country, within the broader context of U.S. history. Incorporated in 1898, the Society collects, preserves, and makes available materials of historical character and interest, and collaborates with other groups and individuals with similar aims. The society operates the Oregon History Center that includes the Oregon Historical Society Museum in downtown Portland.