Flatman is a surname. Notable people with the surname include:
Ada Flatman (1876–1952), British suffragette Barry Flatman (born 1950), Canadian actor David Flatman (born 1980), English rugby player Frederick Flatman (1843–1911), New Zealand Member of Parliament Nat Flatman (1810–1860), 19th-century English champion jockey Nigel Flatman (born 1960), English motorcycle speedway rider Thomas Flatman (1635–1688), English poet and miniature painter
See also Flatman (character), Marvel Comics character and member of the Great Lakes Avengers Flatmania, Franco-Canadian television series