| Coordinates: | 57.87°N -6.69°W |
| Location Map: | Scotland Outer Hebrides |
| Caption: | Soay Mòr shown within the Outer Hebrides |
| Gridreference: | NB063051 |
| Celtic Name: | Sòdhaigh Mòr |
| Area: | 45 ha (111 acres) |
| Area Rank: | 210= |
| Highest Elevation: | 37 m (121 ft) |
| Population: | 0 |
| Local Authority: | Na h-Eileanan Siar |
| References: | [1] |
Soay Mòr (Gaelic; Scottish Gaelic: Sòdhaigh Mòr) is an island in West Loch Tarbert, between the northern and southern parts of Harris. The uninhabited island is separated from the southwest coast of North Harris by the Soay Sound. The adjacent Soay Beag is accessible on foot at low tide.