McCullagh is a surname. Notable people with the surname include:
Colm McCullagh, Gaelic Football player for County TyroneCrawford McCullagh (1868–1948), Unionist politician in Northern IrelandDavid McCullagh, Irish journalist and authorDeclan McCullagh, American journalist and columnist for CBSNews.comEdward McCullagh, nationalist politician and farmer in Northern IrelandFrancis McCullagh, (1874–1956) war correspondentGeorge McCullagh (1905–1952), Canadian newspaper owner 1936–1952James McCullagh (1809–1847), Irish mathematicianJames Benjamin McCullagh (1854–1921), Anglican missionary in British ColumbiaJohn H. McCullagh (1842–1893), American law enforcement officer in New YorkIan Andrew McCullagh, (Born 1963), United Nations P4 Engineer, New York, Vienna, Palestine, Israel.Noel McCullagh (born 1975), Irish journalist living in the NetherlandsPeter McCullagh, Irish statistician from Northern IrelandSheila K. McCullagh MBE (born 1920), British author of children's books