| Saug-a-Gaw-Sing 1 | |
| Official Name: | Saug-a-Gaw-Sing Indian Reserve No. 1 |
| Settlement Type: | Indian reserve |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 200 |
| Coordinates: | 49.1333°N -113°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Rainy River |
| Subdivision Type3: | First Nation |
| Subdivision Name3: | Naongashiing |
| Area Land Km2: | 0.68 |
| Population Footnotes: | [1] |
| Population Total: | 136 |
| Population As Of: | 2021 |
| Population Density Km2: | 200.9 |
| Website: | www.bigisland.ca |
Saug-a-Gaw-Sing 1 is a First Nations reserve on Lake of the Woods in northwestern Ontario, Canada. It is the main reserve of the Anishnaabeg of Naongashiing.