| Mardanas Island | |
| Map: | Philippines |
| Map Relief: | yes |
| Coordinates: | 4.7214°N 119.145°W |
| Archipelago: | Sulu Archipelago |
| Waterbody: | Celebes Sea |
| Area Km2: | 0.1 |
| Area Footnotes: | [1] |
| Country: | Philippines |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Bangsamoro Autonomous Region in Muslim Mindanao |
| Country Admin Divisions Title 1: | Province |
| Country Admin Divisions 1: | Tawi-Tawi |
| Country Admin Divisions Title 2: | Municipality |
| Country Admin Divisions 2: | Sitangkai |
Mardanas Island is an island in the municipality of Sitangkai, Tawi-Tawi. With an area of . It is officially known as Siluag in the 1939 Census Atlas of the Philippines,[2] however locals and the Philippine Navy disputes this name.[1] It is one of the last islands of the Sulu Archipelago nearest the Philippine-Malaysian border and is next to Panguan Island.