Homonhon Island is an island in the province of Eastern Samar, Philippines, on the east side of Leyte Gulf. The 20-kilometre long island is part of the municipality of Guiuan, encompassing eight barangays: Bitaugan, Cagusu-an, Canawayon, Casuguran, Culasi, Habag, Inapulangan, and Pagbabangnan.