| Agency 1 | |
| Official Name: | Agency Indian Reserve No. 1 |
| Settlement Type: | Indian reserve |
| Pushpin Map: | Canada Ontario |
| Pushpin Mapsize: | 200 |
| Coordinates: | 48.6242°N -93.3619°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Rainy River |
| Subdivision Type3: | First Nations |
| Subdivision Name3: | Couchiching, Mitaanjigamiing, Naicatchewenin & Nigigoonsiminikaaning |
| Area Land Km2: | 0.48 |
| Population Footnotes: | [1] |
| Population Total: | 0 |
| Population As Of: | 2021 |
| Population Density Km2: | 0.0 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
Agency 1 is a First Nations reserve in the Canadian province of Ontario in the northwest., there is no permanent population. The Indian reserve is shared among four First Nations: Couchiching First Nation, Mitaanjigamiing First Nation, Naicatchewenin First Nation and Nigigoonsiminikaaning First Nation.