| Gatter Island | |
| Pushpin Map: | Canada Nunavut#Canada |
| Native Name Link: | Inuktitut |
| Location: | Lake Hazen |
| Coordinates: | 81.918°N -69.093°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 |
Gatter Island is an uninhabited island within Qikiqtaaluk Region, Nunavut, Canada. An island within an island, it is located in Lake Hazen on Ellesmere Island within Quttinirpaaq National Park. The smaller Clay Island lies off its southern shore.