Ships hit by U-553
See the profile page for U-553
| Date | U-boat | Commander | Name of ship | Tons | Nat. | Convoy | ||
| 12 Jun, 1941 | U-553 | Karl Thurmann | Ranella | 5.590 |  | nw | OG-64 | |
| 12 Jun, 1941 | U-553 | Karl Thurmann | Susan Mærsk | 2.355 |  | br | OG-64 | |
| 15 Oct, 1941 | U-553 | Karl Thurmann | Ila | 1.583 | | nw | SC-48 | |
| 15 Oct, 1941 | U-553 | Karl Thurmann |  | Silvercedar | 4.354 | | br | SC-48 |
| 17 Oct, 1941 | U-553 | Karl Thurmann | | Bold Venture | 3.222 |  | pa | SC-48 |
| 15 Jan, 1942 | U-553 | Karl Thurmann | Diala (d.) | 8.106 | | br | ON-52 | |
| 22 Jan, 1942 | U-553 | Karl Thurmann | Innerøy | 8.260 | | nw | ||
| 12 May, 1942 | U-553 | Karl Thurmann | | Leto | 4.712 |  | nl | |
| 12 May, 1942 | U-553 | Karl Thurmann | | Nicoya | 5.364 | | br | |
| 2 Jun, 1942 | U-553 | Karl Thurmann | Mattawin | 6.919 | | br | ||
| 3 Aug, 1942 | U-553 | Karl Thurmann | Belgian Soldier (d.) | 7.167 |  | be | ON-115 | |
| 18 Aug, 1942 | U-553 | Karl Thurmann | | Blankaholm | 2.845 |  | sw | TAW-13 |
| 18 Aug, 1942 | U-553 | Karl Thurmann | Empire Bede | 6.959 | | br | TAW-13 | |
| 18 Aug, 1942 | U-553 | Karl Thurmann | John Hancock | 7.176 |  | am | TAW-13 | |
| 9 Dec, 1942 | U-553 | Karl Thurmann | Charles L.D. | 5.273 | | br | HX-217 | |
| 79.885 | ||||||||
| 13 ships sunk (64.612 tons) and 2 ships damaged (15.273 tons).
| ||||||||