Hellmut Rohweder (17 January 1914 – 9 February 2008) was a German chief engineer ( abbreviated LI) on a U-boat in World War II and recipient of the Knight's Cross of the Iron Cross (). The Knight's Cross of the Iron Cross was awarded to recognise extreme battlefield bravery or successful military leadership. Rohweder served on under the command of Heinz von Reiche and Udo Behrends, on under Jost Metzler, on under Hans-Jürgen Auffermann, and on under Ernst-August Gerke.