| Conflict: | Convoy SG 6/LN 6 |
| Partof: | World War II, Battle of the Atlantic, Battle of the St. Lawrence |
| Date: | 27–28 August 1942 |
| Place: | Strait of Belle Isle |
| Combatant2: |  Canada United States |
| Commander1: | Karl Dönitz Eberhard Hoffmann Paul Hartwig |
| Strength1: | 2 U-boats |
| Strength2: | 6 merchant ships 3 escorts/1 escort |
| Casualties2: | 2 ships sunk 1 ship damaged |
Convoy SG-6 was a supply convoy of merchant and troop ships during the Second World War. It was one of the numbered SG Convoys from Sydney to Greenland. The convoy was split into two groups, with Chatham being escorted by USCG Mojave in a formation coded SG-6F, while the remainder were with SG-6S. SG-6F was found and attacked on 27 September 1942 by, sinking Chatham, while contacted SG-6S, sinking 1 ship and damaging another. Convoy LN-6, which was a supply convoy from Quebec City to Goose Bay, was nearby and its escort broke off to conduct rescue operations.
| Name[1] | Flag | Tonnage (GRT) | Notes |
|---|---|---|---|
| Chatham (1926) | | 5,649 | Sunk by |
| Escort SG-6F | |||
| Alcoa Guard (1918) | | 4,905 | |
| Arlyn (1919) | | 3,304 | Sunk by |
| Biscaya (1939) |  | 1,323 | |
| Harjurand (1919) | | 812 | |
| Escort SG-6S | |||
| Escort SG-6S | |||
| Damaged by | |||
| Escort LN-6 | |||