Harold Christian Hagen (November 10, 1901 – March 19, 1957) was a Minnesota politician. He was a Farmer-Laborite and then a Republican, serving the ninth district from 1943 to 1955.
Born in Crookston, Minnesota, he was Lutheran of Norwegian ancestry. He attended St. Olaf College and then began as a publisher and editor of a Norwegian language newspaper and publisher of the Polk County Leader in Crookston.
He later served as secretary to Representative Richard T. Buckler. Succeeding Buckler, Hagen was elected as a candidate of the Farmer-Labor Party to the House of Representatives, representing Minnesota's 9th congressional district. He was subsequently reelected as a Republican U.S. Representative from 1943 to 1955. After his defeat in the United States House election, 1954, Hagen worked in Washington, D.C.'s public relations business. Altogether, he served in the 78th, 79th, 80th, 81st, 82nd, and 83rd congresses (January 3, 1943 – January 3, 1955).