Hagemann is a surname. Notable people with the surname include:
Axel Otto Kristian Hagemann (1856–1907), Norwegian politicianCarl Hagemann (1867–1940), German chemist, industrial manager and art collectorFranziska Hagemann (born 1989), German football playerFredrik Hagemann (born 1929), Norwegian geologist and bureaucratGro Hagemann (born 1945), Norwegianhistorian
Karen Hagemann (born 1955), German-American historianKristian Kornelius Hagemann Brandt (1831–1905), Norwegian military officer and engineerSara Hagemann, Danish-born, London-based expert on the European UnionSonja Hagemann (1898–1983), Norwegian literary historian and literary criticVictoria Hagemann, Swiss Olympic fencerWolf Hagemann (1898–1983), highly decorated Generalleutnant in the Wehrmacht during World War II