The U-boat War Badge was a German war badge that was awarded to U-boat crew members during World War I and World War II.

Albrecht Brandi was a German U-boat commander in Nazi Germany's Kriegsmarine during World War II. Together with Wolfgang Lüth, he was the only Kriegsmarine sailor who was awarded with the Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds. The Knight's Cross, and its variants were the highest awards in the military and paramilitary forces of Nazi Germany during World War II. Brandi is credited with the sinking of eight merchant ships for a total of 25,879 gross register tons (GRT), one auxiliary warship of 810 GRT, and three warships of 5,000 long tons.