Isabel Island is an inhabited island in the province of Romblon in the Philippines. It is part of barangay Nasunogan in the municipality of Banton. In the 1918 census, the island together with its sister island Carlota Island constituted one single barrio named "Isla de los Hermanos" with 23 inhabitants.

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Coordinates: 12°53′N 122°01′E / 12.883°N 122.017°E / 12.883; 122.017