The Knights Cross with Oak Leaves, introduced on June 3, 1940, was awarded to Knights Cross recipients for further acts of courage. A fan of 3 Oak Leaves in silver surmounted the paper clip hanger. There were only 853 of those awarded and 29 went to the U-boat force.
| Name and rank | Age | Crew | Date | Boat | ||
| 1. | Kptlt. Prien, Günther + | (32) | 33 | 20 Oct, 1940 | U-47 | |
| 2. | Kptlt. Kretschmer, Otto | (28) | 30 | 4 Nov, 1940 | U-99 | |
| 3. | Kptlt. Schepke, Joachim + | (28) | 30 | 1 Dec, 1940 | U-100 | |
| 4. | Oblt. Endrass, Engelbert + | (30) | 34 | 10 Jun, 1941 | U-46 | |
| 5. | Kptlt. Liebe, Heinrich | (33) | 27 | 10 Jun, 1941 | U-38 | |
| 6. | Kptlt. Schultze, Herbert | (31) | 30 | 12 Jun, 1941 | U-48 | |
| 7. | KrvKpt. Schütze, Viktor | (35) | 25 | 14 Jul, 1941 | U-103 | |
| 8. | Oblt. Suhren, Reinhard | (25) | 35 | 31 Dec, 1941 | U-564 | |
| 9. | Kptlt. Lehmann-Willenbrock, Heinrich | (30) | 31 | 31 Dec, 1941 | U-96 | |
| 10. | Kptlt. Topp, Erich | (27) | 34 | 11 Apr, 1942 | U-552 | |
| 11. | Kptlt. Hardegen, Reinhard | (29) | 33 | 23 Apr, 1942 | U-123 | |
| 12. | Kptlt. Schnee, Adalbert | (28) | 34 | 15 Jul, 1942 | U-201 | |
| 13. | Kptlt. Mützelburg, Rolf + | (29) | 32 | 15 Jul, 1942 | U-203 | |
| 14. | KrvKpt. Scholtz, Klaus | (34) | 27 | 10 Sep, 1942 | U-108 | |
| 15. | Kptlt. Bleichrodt, Heinrich | (32) | 33 | 23 Sep, 1942 | U-109 | |
| 16. | Kptlt. Lüth, Wolfgang + | (29) | 33 | 13 Nov, 1942 | U-181 | |
| 17. | KrvKpt. Merten, Karl-Friedrich | (37) | 26 | 16 Nov, 1942 | U-68 | |
| 18. | Kptlt. Guggenberger, Friedrich | (27) | 34 | 8 Jan, 1943 | U-81 | |
| 19. | Kptlt. Mohr, Johann + | (26) | 34 | 13 Jan, 1943 | U-124 | |
| 20. | Kptlt. Lassen, Georg | (27) | 35 | 7 Mar, 1943 | U-160 | |
| 21 | Gradm. Dönitz, Karl | (52) | 1910 | 6 Apr, 1943 | BdU | |
| 22. | Kptlt. Brandi, Albrecht | (28) | 35 | 11 Apr, 1943 | U-617 | |
| 23. | Kptlt. Bülow, Otto von | (31) | 30 | 26 Apr, 1943 | U-404 | |
| 24. | Kptlt. Gysae, Robert | (32) | 31 | 31 May, 1943 | U-177 | |
| 25. | Kptlt. Emmermann, Carl | (28) | 34 | 4 Jul, 1943 | U-172 | |
| 26. | Kptlt. Henke, Werner + | (34) | 33 | 4 Jul, 1943 | U-515 | |
| 27. | Kpt. Hartmann, Werner | (41) | 21 | 5 Nov, 1944 | U-198 | |
| 28. | Kptlt. Lange, Hans-Günther | (28) | 37a | 29 Apr, 1945 | U-711 | |
| 29. | Kptlt. Thomsen, Rolf | (30) | 36 | 29 Apr, 1945 | U-1202 |
| + | died in WW II | * service begins in the Navy |
| +* | died in WW II by accident | |


