| Saint-Eustache | |
| Commune Status: | Commune |
| Arrondissement: | Annecy |
| Canton: | Annecy-4 |
| Insee: | 74232 |
| Postal Code: | 74410 |
| Mayor: | Jean-Pascal Albran[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Grand Annecy |
| Coordinates: | 45.7967°N 6.1489°W |
| Elevation Min M: | 600 |
| Elevation Max M: | 1680 |
| Area Km2: | 10.54 |
| Demonym: | Eustachois / Eustachoises |
Saint-Eustache (in French pronounced as /sɛ̃t‿østaʃ/; Sant-<u>A</u>fyo) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France.