Convoy route OS
| Code | OS |
| Route | UK - Freetown |
| Area | North Atlantic, Central Atlantic |
| Notes | Convoys from UK to Freetown |
| Convoys | Date | Losses | |
1941 | |||
| OS-1 | Jul 1941 | 3 ships sunk with a total of 19,090 tons. | |
| OS-4 | Aug 1941 | 5 ships sunk with a total of 30,705 tons. | |
| OS-7 | Oct 1941 | 2 ships sunk with a total of 5,376 tons. | |
| OS-10 | Oct 1941 | 1 ship sunk with a total of 5,998 tons. | |
| OS-12 | Nov 1941 | 2 ships sunk with a total of 10,437 tons. | |
1942 | |||
| OS-25 | Apr 1942 | 1 ship sunk with a total of 8,941 tons. | |
| OS-28 | May 1942 | 3 ships sunk with a total of 18,115 tons. | |
| OS-33 | Jul 1942 | 6 ships sunk with a total of 39,692 tons. | |
| OS-34 | Jul 1942 | 2 ships sunk with a total of 11,096 tons. | |
| OS-36 | Aug 1942 | 1 ship sunk with a total of 3,220 tons. | |
| OS-37 | Sep 1942 | 1 ship sunk with a total of 7,173 tons. | |
| OS-38 | Sep 1942 | 1 ship sunk with a total of 5,296 tons. | |
1943 | |||
| OS-44 | Mar 1943 | 4 ships sunk with a total of 17,376 tons. | |
| OS-45 | Apr 1943 | 2 ships sunk with a total of 9,547 tons. | |
| OS-49 | Jun 1943 | 1 ship sunk with a total of 4,748 tons. | |
| OS-52 | Aug 1943 | 1 ship sunk with a total of 4,116 tons. | |
| OS-62 | Dec 1943 | 1 ship sunk with a total of 1,340 tons. | |
1944 | |||
| OS-71 | Apr 1944 | 1 ship sunk with a total of 8,261 tons. | |
18 OS convoys successfully attacked in the war.
38 ships were sunk with a total of 210,527 GRT.
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