Ships hit by U-521
See the profile page for U-521
| Date | U-boat | Commander | Name of ship | Tons | Nat. | Convoy | ||
| 2 Nov, 1942 | U-521 | Klaus Bargsten |  | Hartington | 5.496 |  | br | SC-107 |
| 3 Nov, 1942 | U-521 | Klaus Bargsten | Hahira | 6.855 |  | am | SC-107 | |
| 8 Feb, 1943 | U-521 | Klaus Bargsten | HMS Bredon (T 223) | 750 | | br | Gibr-2 | |
| 18 Mar, 1943 | U-521 | Klaus Bargsten | | Molly Pitcher | 7.200 | | am | UGS-6 |
| 20.301 | ||||||||
| 4 ships sunk (20.301 tons).
| ||||||||