Sibuyan is a crescent-shaped island, the second largest in an archipelago comprising  Romblon Province, Philippines. Located in the namesake Sibuyan Sea, it has an area of . The island has two prominent peaks, Mount Guiting-Guiting with a height of and Mount Nailog with a height of . The people speak the Sibuyanon dialect of Romblomanon, a Visayan language.