| Rainy Lake 26B | |
| Official Name: | Rainy Lake Indian Reserve No. 26B |
| Settlement Type: | Indian reserve |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 200 |
| Coordinates: | 48.8333°N -149°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Rainy River |
| Subdivision Type3: | First Nation |
| Subdivision Name3: | Nigigoonsiminikaaning |
| Area Footnotes: | [1] |
| Area Land Km2: | 10.68 |
Rainy Lake 26B is a First Nations reserve in Rainy River District, Ontario, Canada. It is one of the reserves of the Nigigoonsiminikaaning First Nation.