Gerhard III of Holstein-Rendsburg (c. 1292 – 1 April 1340), sometimes called Gerhard the Great, and in Denmark also known as Count Gert or den kullede greve ("the bald count"), was a German prince who ruled Schauenburg and Holstein-Rendsburg and during the interregnum of 1332–40 also a large part of Denmark.His father was Henry I, Count of Holstein-Rendsburg (c. 1258 – 5 August 1304).