| Saint-Saturnin-les-Avignon Observatory | Saint-Saturnin-lès-Avignon | — |
| Saint-Sulpice Observatory | Saint-Sulpice | — |
| Sainte Helene Observatory | Sainte-Hélène | — |
| Sainte-Clotilde observatory | Reunión | — |
| Salvia Observatory | Saulges | — |
| SATINO Remote observatory | Saint-Michel-l'Observatoire | — |
| Savigny-le-Temple observatory | Savigny-le-Temple | — |
| Schmelz Observatory | Schmelz | — |
| Soisy-sur-Seine observatory | Soisy-sur-Seine | — |
 Solar Observatory Tower Meudon | Meudon | — |
| Sollies-Pont observatory | Solliès-Pont | — |
| Southern Stars Observatory | Faaa | — |
| St Paul Observatory | Reunión | — |
| St-Martin Observatory | Amathay-Vésigneux | — |
| St. Michel sur Meurthe observatory | Saint-Michel-sur-Meurthe | — |
 SVOM | — | — |
| Tamaris Observatory | La Seyne-sur-Mer | — |
| Terres Blanches observatory | canton of Reillanne | — |
 The Space Observatory (Observatoire de l'Espace) | — | — |
| Tiki observatory | Puna'auia observatory | — |
 Torre de la Babotte | Montpellier | — |
| Vallauris observatory | Vallauris | — |
 Vallot observatory | Saint-Gervais-les-Bains | 4.358 m |
| Valmeca observatory | Puimichel | — |
| Varennes observatory | Varennes | — |
| Village-neuf Observatory | Gare de Neuf-Brisach Ville | — |
| Volcanological and Seismological Observatory of Guadeloupe | Gourbeyre | — |
| Wormout observatory | Wormhout | — |
| Yerres-Canotiers observatory | Yerres | — |