| Thayawthadangyi | |
| Settlement Type: | Island of the Mergui Archipelago |
| Coordinates: | 12.3458°N 98.0014°W |
| Area Total Km2: | 120 |
| Elevation M: | 533 |
| Pushpin Map: | Myanmar |
| Pushpin Label Position: | left |
| Timezone1: | Myanmar Standard Time |
| Utc Offset1: | +6:30 |
| Subdivision Type: | Country |
| Subdivision Name: | Myanmar |
| Subdivision Type1: | Region |
| Subdivision Name1: | Taninthayi |
Thayawthadangyi Kyun, also known as Elphinstone Island,[1] is an island in the Mergui Archipelago, Burma.
Thayawthadangyi is irregular in shape, hilly and thickly wooded. It is part of the northern group of islands of the archipelago.
Thayawthadangyi's area is 120km2.[2] The highest points, both rising on the western part of the island are 533m (1,749feet) Elphinstone Peak and 430m (1,410feet) False Peak.
Daung Kyun lies off Thayawthadangyi's southeastern shore.