Mambacayao Gamay is an island located in the Visayas, Philippines. The island is part of the Bantayan Island Group. It is situated around from Bantayan, Cebu and around from the port of Escalante, Negros Occidental. Mambacayao Gamay is also part of Barangay Lipayran, along with Lipayran Island and Mambacayao Daku Island and under the jurisdiction of the municipality of Bantayan, Cebu. Most of the inhabitants of the islands are fisherfolks. The estimated total area of the island is and has a high population density.