Ditmar may refer to:
People with the surname Art Ditmar (1929–2021), American Major League Baseball pitcher Karl von Ditmar (1822–1892), Baltic German geologist and explorer Nikolay Fyodorovitch von Ditmar (1865–1919), Russian politician and businessman
People with the given name Ditmar Jakobs (born 1953), German soccer player Ditmar Staffelt, member of the 16th German Bundestag
See also Dietmar, a given name Ditmar Award, for Australian science fiction Ditmars (disambiguation) Dittmar, a surname