Otto Ernst Lindemann (28 March 1894 – 27 May 1941) was a German Kapitän zur See (naval captain). He was the only commander of the battleship Bismarck during its eight months of service in World War II. He was posthumously awarded the Knight's Cross of the Iron Cross (Ritterkreuz des Eisernen Kreuzes), at the time the highest award in the military and paramilitary forces of Nazi Germany. The medal was presented to his widow, Hildegard, on 6 January 1942.