Fritz Frauenheim (9 January 1912 - 28 September 1969) was a German U-boat commander of the Second World War. From September 1939 until retiring from front line service in December 1940, he sank 19 ships for a total of , and damaged two others. For this he received the Knight's Cross of the Iron Cross (), among other commendations. The Knight's Cross of the Iron Cross was awarded to recognise extreme battlefield bravery or successful military leadership.