Convoy route OS
| Code | OS |
| Route | UK - Freetown |
| Area | |
| Notes |
| Convoys | Date | Losses |
| OS-1 | Jul 1941 | 3 ships sunk for a total of 19.090 tons |
| OS-4 | Aug 1941 | 5 ships sunk for a total of 30.705 tons |
| OS-7 | Oct 1941 | 1 ship sunk for a total of 4.926 tons |
| OS-10 | Oct 1941 | 1 ship sunk for a total of 5.998 tons |
| OS-12 | Nov 1941 | 2 ships sunk for a total of 10.437 tons |
| OS-25 | Apr 1942 | 1 ship sunk for a total of 8.941 tons |
| OS-28 | May 1942 | 3 ships sunk for a total of 18.115 tons |
| OS-33 | Jul 1942 | 6 ships sunk for a total of 39.692 tons |
| OS-34 | Jul 1942 | 2 ships sunk for a total of 11.096 tons |
| OS-36 | Aug 1942 | 1 ship sunk for a total of 3.220 tons |
| OS-37 | Sep 1942 | 1 ship sunk for a total of 7.173 tons |
| OS-38 | Sep 1942 | 1 ship sunk for a total of 5.296 tons |
| OS-44 | Mar 1943 | 4 ships sunk for a total of 17.376 tons |
| OS-45 | Apr 1943 | 2 ships sunk for a total of 9.547 tons |
| OS-49 | Jun 1943 | 1 ship sunk for a total of 4.748 tons |
| OS-51 | Jul 1943 | |
| OS-52 | Aug 1943 | 1 ship sunk for a total of 4.116 tons |
| OS-62 | Dec 1943 | 1 ship sunk for a total of 1.340 tons |
| OS-64 | Jan 1944 | |
| OS-71 | Apr 1944 | 1 ship sunk for a total of 8.261 tons |
20 OS convoys successfully attacked in the war.
Map showing ships hit from convoys on route OS. 34 ships with known position.
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