Mannheim or Manheim is a surname. Notable people with the surname include:
Amédée Mannheim (1831–1906), the inventor of the modern slide rule
Camryn Manheim (born 1961), American actress
Carl Gustaf Emil Mannerheim (1867–1951), the Finnish military leader and national hero of the Second World War
Karl Mannheim (1893-1947), Hungarian sociologist
Lucie Mannheim (1899–1976), German actress
Ralph Manheim (1907-1992), American translator
Kjetil Manheim (born 1968), Norwegian musician
Fictional characters:
Bruno "Ugly" Mannheim, Superman villain