RB 6
| Name | RB 6 |
| Type | Barge |
| GRT | 800 tons |
| Country |  British |
| Built | 1917 |
| Builder | |
| Operator | War Office |
| History | refrigerated barge |
U-boat attacks on Barge RB 6
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Aug 1917 | UC 72 (Ernst Voigt) | Sunk | Stopped and scuttled 130 miles WSW of Ushant | 47° 34'N, 8° 05'W | 0 | ||
| Under tow of HS 4, which was also sunk. | ||||||||
Position of attack on Rb 6
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