Harlan Francis Hagen (born October 8, 1914) was a Democratic member of the United States House of Representatives from California. He represented California’s 18th Congressional District and served in Congress for seven consecutive terms. His tenure in the House began on January 3, 1953, and concluded on January 3, 1967, marking fourteen years in federal office.

During his time in Congress, Hagen served as a Representative for California at a period when the state was undergoing significant growth and political change. Identified in historical records as a former member of Congress, he is noted primarily for his long service in the House as a Democrat from the 18th District. Further details about his committee assignments, office operations, or public communications are not provided in the available metadata.