 Observatoire Marin de la Réunion | Reunión | — |
 Observatoire Midi-Pyrénées | Toulouse | — |
| Observatories of the Sciences of the Universe | — | — |
 Observatorio Astronómico de Besançon | Besanzón | 360 m |
 Observatorio Astronómico de Montpellier | Montpellier | — |
| Observatorio de Dax | Dax | — |
 Observatorio de Estrasburgo | Estrasburgo | 142 m |
 Observatorio de Haute-Provence | Saint-Michel-l'Observatoire | 650 m |
 Observatorio de la Costa Azul | Niza | — |
 Observatorio de la Sorbona | V Distrito de París | — |
 Observatorio de Lyon | Séptimo Distrito de Lyon | — |
 Observatorio de Marsella | Marsella | 40 m |
 Observatorio de Meudon | Meudon | — |
| Observatorio de Niza | La Trinité | 372 m |
 Observatorio de París | Montparnasse | — |
 Observatorio de Pises | Gard | 1.301 m |
 Observatorio de Toulouse | Toulouse | — |
| Observatorio de Versailles Saint Quentin en Yvelines | Guyancourt | — |
| Observatorio Vulcanológico de Piton de la Fournaise | Le Tampon | 1.550 m |
| Observatory of Nurol | Aurec-sur-Loire | 448 m |
| Observatory of Saint-Pardon-de-Conques | Saint-Pardon-de-Conques | — |
| Observatory of Sciences of the Universe of the University of Paris-Sud | París | — |
 Observatory of the rue Serpente | — | — |
| Observatório Les Engarouines | Mallemort | — |
| OCA-DLR Asteroid Survey | Alpes Marítimos | 1.271 m |
| OPERA Observatory | Saint-Palais | — |
| Osenbach observatory | Osenbach | — |
| Ottmarsheim observatory | Ottmarsheim | — |
| Ottmarsheim Observatory | Ottmarsheim | — |
| Pamatai Magnetic Observatory | Polinesia Francesa | — |
| PASTIS Observatory | Banon | — |
| Perpignan observatory | Perpiñán | — |
 Pic du Midi Observatory | Bagnères-de-Bigorre | 2.877 m |
| Planetarium de Vaulx-en-Velin Observatory | Vaulx-en-Velin | — |
 Planetology and Astrophysics Institute of Grenoble | Grenoble | — |
| Pommier observatory | Chapdes-Beaufort | — |
| Pont-à-Mousson Observatory | Pont-à-Mousson | — |
 Provencal Baronnies Observatory | Moydans | — |
 Pujalt Observatory | Pujalt | 750 m |
| Puna'auia observatory | Punaauia | — |
| Quincampoix observatory | Quincampoix | — |
| Ramonville Saint Agne observatory | Ramonville-Saint-Agne | — |
| Reilhanette Observatory | Reilhanette | — |
| ROSA observatory | Verclause | — |
| Rouet observatory | — | — |
| Réseau de surveillance volcanologique et sismologique de Mayotte | — | — |
| Saint-Caprais observatory | Rabastens-de-Bigorre | — |
 Saint-Malo marigraph | Saint-Servan | — |