D'Oyly Carte Island is a small private island in the River Thames, England, administratively and historically part of Weybridge, near its other inhabited islands and near part of Old Shepperton, on the reach above Sunbury Lock, 200 metres downstream from Shepperton Lock. Before 1890 the island was known as Folly Eyot. The impresario Richard D'Oyly Carte bought the island in about 1890 and built the 13-bedroom Eyot House on the property, completed in 1898. His widow sold the island, and it was last sold in 2021.