Carl Geibel (né Carl Stephan Franz; 19 May 1842 - 5 June 1910) was a Hungarian-born German book dealer and publisher.
He built up Duncker & Humblot, the Leipzig based publisher of the Allgemeine Deutsche Biographie (General German Biography), the 56 volume German dictionary of national biography covering approximately 26,500 notable German and Dutch people who died before 1900.