Convoy route OB
| Code | OB |
| Route | Liverpool - Outward (North America) |
| Area | North Atlantic |
| Notes | From September 1939 to July 1940 from Bristol Channel, then from North Channel. In July 1941 merged with ON(F) and ONS. |
| Convoys | Date | Losses | |
1939 | |||
| OB-17 | Oct 1939 | 1 ship sunk with a total of 5,202 tons. | |
| OB-25 | Oct 1939 | 1 ship sunk with a total of 5,317 tons. | |
| OB-46 | Dec 1939 | 1 ship sunk with a total of 8,795 tons. | |
| OB-48 | Dec 1939 | 2 ships sunk with a total of 14,065 tons. | |
1940 | |||
| OB-74 | Jan 1940 | 1 ship sunk with a total of 5,494 tons. | |
| OB-176 | Jul 1940 | 1 ship sunk with a total of 8,999 tons. | |
| OB-188 | Jul 1940 | 4 ships sunk with a total of 29,320 tons. | |
| OB-191 | Jul 1940 | 1 ship sunk with a total of 6,322 tons. | |
| OB-193 | Aug 1940 | 1 ship sunk with a total of 5,408 tons. | |
| OB-197 | Aug 1940 | 2 ships sunk with a total of 8,953 tons. | |
| OB-198 | Aug 1940 | 1 ship sunk with a total of 4,397 tons. | |
| OB-202 | Aug 1940 | 2 ships sunk with a total of 16,620 tons. | |
| OB-201 | Aug 1940 | 1 ship sunk with a total of 3,774 tons. | |
| OB-205 | Aug 1940 | 4 ships sunk with a total of 15,934 tons. | |
| OB-206 | Sep 1940 | 1 ship sunk with a total of 4,261 tons. | |
| OB-213 | Sep 1940 | 2 ships sunk with a total of 16,169 tons. | |
| OB-216 | Sep 1940 | 5 ships sunk with a total of 41,338 tons. | |
| OB-217 | Sep 1940 | 5 ships sunk with a total of 29,066 tons. | |
| OB-218 | Sep 1940 | 5 ships sunk with a total of 26,140 tons. | |
| OB-219 | Sep 1940 | 1 ship sunk with a total of 3,278 tons. | |
| OB-220 | Sep 1940 | 1 ship sunk with a total of 2,499 tons. | |
| OB-221 | Oct 1940 | 1 ship sunk with a total of 5,943 tons. | |
| OB-222 | Oct 1940 | 1 ship sunk with a total of 6,123 tons. | |
| OB-225 | Oct 1940 | 1 ship sunk with a total of 5,811 tons. | |
| OB-228 | Oct 1940 | 4 ships sunk with a total of 12,822 tons. | |
| OB-229 | Oct 1940 | 2 ships sunk with a total of 11,199 tons. | |
| OB-240 | Nov 1940 | 1 ship sunk with a total of 5,094 tons. | |
| OB-235 | Nov 1940 | 1 ship sunk with a total of 5,168 tons. | |
| OB-234 | Nov 1940 | 1 ship sunk with a total of 3,059 tons. | |
| OB-244 | Nov 1940 | 6 ships sunk with a total of 31,738 tons. | |
| OB-248 | Nov 1940 | 3 ships sunk with a total of 9,833 tons. | |
| OB-249 | Nov 1940 | 1 ship sunk with a total of 4,940 tons. | |
| OB-251 | Dec 1940 | 3 ships sunk with a total of 23,636 tons. | |
| OB-252 | Dec 1940 | 3 ships sunk with a total of 12,325 tons. | |
| OB-256 | Dec 1940 | 2 ships sunk with a total of 7,050 tons. | |
1941 | |||
| OB-261 | Jan 1941 | 1 ship sunk with a total of 6,579 tons. | |
| OB-269 | Jan 1941 | 1 ship sunk with a total of 5,965 tons. | |
| OB-276 | Jan 1941 | 1 ship sunk with a total of 1,570 tons. | |
| OB-279 | Feb 1941 | 2 ships sunk with a total of 9,034 tons. | |
| OB-280 | Feb 1941 | 2 ships sunk with a total of 6,349 tons. | |
| OB-284 | Feb 1941 | 1 ship sunk with a total of 5,462 tons. | |
| OB-287 | Feb 1941 | 1 ship sunk with a total of 6,999 tons. | |
| OB-288 | Feb 1941 | 9 ships sunk with a total of 38,604 tons. | |
| OB-289 | Feb 1941 | 3 ships sunk with a total of 16,761 tons. | |
| OB-290 | Feb 1941 | 3 ships sunk with a total of 12,087 tons. | |
| OB-292 | Mar 1941 | 1 ship sunk with a total of 3,050 tons. | |
| OB-293 | Mar 1941 | 3 ships sunk with a total of 32,464 tons. | |
| OB-302 | Mar 1941 | 2 ships sunk with a total of 5,510 tons. | |
| OB-304 | Apr 1941 | 1 ship sunk with a total of 8,132 tons. | |
| OB-296 | Apr 1941 | 1 ship sunk with a total of 2,697 tons. | |
| OB-306 | Apr 1941 | 1 ship sunk with a total of 6,563 tons. | |
| OB-309 | Apr 1941 | 2 ships sunk with a total of 12,393 tons. | |
| OB-310 | May 1941 | 2 ships sunk with a total of 9,982 tons. | |
| OB-318 | May 1941 | 9 ships sunk with a total of 50,985 tons. | |
| OB-313 | May 1941 | 2 ships sunk with a total of 12,948 tons. | |
| OB-312 | May 1941 | 1 ship sunk with a total of 6,434 tons. | |
| OB-314 | May 1941 | 1 ship sunk with a total of 5,920 tons. | |
| OB-322 | May 1941 | 1 ship sunk with a total of 7,402 tons. | |
| OB-317 | May 1941 | 3 ships sunk with a total of 13,151 tons. | |
| OB-320 | May 1941 | 2 ships sunk with a total of 10,677 tons. | |
| OB-319 | Jun 1941 | 1 ship sunk with a total of 4,719 tons. | |
| OB-327 | Jun 1941 | 4 ships sunk with a total of 27,156 tons. | |
| OB-328 | Jun 1941 | 3 ships sunk with a total of 14,020 tons. | |
| OB-324 | Jun 1941 | 2 ships sunk with a total of 9,426 tons. | |
| OB-329 | Jun 1941 | 4 ships sunk with a total of 23,209 tons. | |
| OB-323 | Jun 1941 | 1 ship sunk with a total of 7,816 tons. | |
| OB-330 | Jun 1941 | 3 ships sunk with a total of 18,252 tons. | |
| OB-336 | Jun 1941 | 3 ships sunk with a total of 11,285 tons. | |
| OB-337 | Jul 1941 | 2 ships sunk with a total of 8,362 tons. | |
| OB-341 | Jul 1941 | 2 ships sunk with a total of 10,842 tons. | |
70 OB convoys successfully attacked in the war.
154 ships were sunk with a total of 838,897 GRT.
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