| Lock Island | |
| Pushpin Map: | Canada Nunavut#Canada |
| Native Name Link: | Inuktitut |
| Location: | Peel Sound |
| Coordinates: | 73.2667°N -104°W |
| Archipelago: | Arctic Archipelago |
| Country: | Canada |
| Country Admin Divisions Title: | Nunavut |
| Country Admin Divisions: | Nunavut |
| Country Admin Divisions Title 1: | Region |
| Country Admin Divisions 1: | Qikiqtaaluk |
| Population: | Uninhabited |
Lock Island[1] is a member of the Arctic Archipelago in the territory of Nunavut. It lies in Peel Sound across the mouth of Browne Bay, between northeastern Prince of Wales Island and northwestern Somerset Island. Vivian Island lies to the southeast, and Binstead Island to the northeast.