| Le Château-d'Oléron | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Le Château-d'Oléron.svg |
| Arrondissement: | Rochefort |
| Canton: | Île d'Oléron |
| Insee: | 17093 |
| Postal Code: | 17480 |
| Mayor: | Michel Parent[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Île-d'Oléron |
| Coordinates: | 45.8858°N -1.1947°W |
| Elevation Min M: | 0 |
| Elevation Max M: | 10 |
| Area Km2: | 15.67 |
Le Château-d'Oléron (in French pronounced as /lə ʃɑto dɔleʁɔ̃/; Occitan (post 1500);: Lo Chasteu d'Olairon) is a commune located on the Island of Oléron, in the Charente-Maritime department, southwestern France.
The town is surrounded by fortifications in the form of a Bastion fort (similar to a "star fort".)