Hagel is a German surname. Notable people with the surname include:
Catherine Hagel (1894–2008), American supercentenarianChuck Hagel (born 1946), former American Secretary of Defense ("SecDef")Frank Hagel (born 1933), American painter and sculptorGlenn Hagel (born 1949), Canadian politicianJohn Hagel III, author and former consultantKyle Hagel (born 1985), Canadian ice hockey playerLawrence B. Hagel, United States federal judgeOtto Hagel (1909–1973), German-born American photographer and filmmaker