Le Château-d'Oléron (French pronunciation: [lə ʃɑto dɔleʁɔ̃]; Occitan: Lo Chasteu d'Olairon) is a commune located on the Island of Oléron, in the Charente-Maritime department, southwestern France.

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Le Château-d'Oléron
Commune
Art and craft shops in Le Château-d'Oléron
Coat of arms
Location of Le Château-d'Oléron
Le Château-d'Oléron Show map of France Le Château-d'Oléron Show map of Nouvelle-Aquitaine
Coordinates: 45°53′09″N 1°11′41″W
Country	France
Region	Nouvelle-Aquitaine
Department	Charente-Maritime
Arrondissement	Rochefort
Canton	Île d'Oléron
Intercommunality	Île-d'Oléron
Government
• Mayor (2020–2026)	Michel Parent[1]
Area 1	15.67 km2 (6.05 sq mi)
Population  (2021)[2]	4,319
• Density	280/km2 (710/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	17093 /17480
Elevation	0–10 m (0–33 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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The town is surrounded by fortifications in the form of a Bastion fort (similar to a "star fort".)

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  Le Château-d'Oléron, 1703 military mock-up
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  The main gate of the citadel
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  Old oyster farmers' huts renewed and converted into arts and crafts shops

• Communes of the Charente-Maritime department