| Mandaui | |
| Coordinates: | 13.836°N 120.33°W |
| Map Relief: | yes |
| Location: | South China Sea |
| Archipelago: | Lubang Group of Islands |
| Country: | Philippines |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Mimaropa |
| Country Admin Divisions Title 1: | Province |
| Country Admin Divisions 1: | Occidental Mindoro |
| Country Admin Divisions Title 2: | Municipality |
| Country Admin Divisions 2: | Looc |
| Country Admin Divisions 3: | Ambil |
| Country Admin Divisions Title 3: | Barangay |
Mandaui is a small island in the Philippines and part of the Lubang group of islands. It is around 0.75miles northeast of Ambil Island and is administered under the barangay of Ambil, in the municipality of Looc, Occidental Mindoro. The island has two "small hills of uneven height."