| Usseau | |
| Arrondissement: | Niort |
| Canton: | Mignon-et-Boutonne |
| Insee: | 79334 |
| Postal Code: | 79210 |
| Commune: | Val-du-Mignon |
| Coordinates: | 46.1747°N -0.5789°W |
| Elevation M: | 30 |
| Elevation Min M: | 18 |
| Elevation Max M: | 49 |
| Area Km2: | 16.10 |
| Population: | 870 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Usseau is a former commune in the Deux-Sèvres department in western France. On 1 January 2019, it was merged into the new commune Val-du-Mignon.[2]