| Oussoy-en-Gâtinais | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Oussoy-en-Gâtinais (Loiret).svg |
| Arrondissement: | Montargis |
| Canton: | Lorris |
| Insee: | 45239 |
| Postal Code: | 45290 |
| Mayor: | François Martin[1] |
| Term: | 2021 - 2026 |
| Intercommunality: | Canaux et Forêts en Gâtinais |
| Coordinates: | 47.907°N 2.642°W |
| Area Km2: | 23.23 |
Oussoy-en-Gâtinais (in French pronounced as /uswa ɑ̃ ɡatinɛ/, literally Oussoy in Gâtinais) is a commune in the Loiret department in north-central France.
The river Solin flows northeastward through the western part of the commune.