| Location Map: | Scotland Ross and Cromarty |
| Coordinates: | 57.7°N -5.53°W |
| Gridreference: | NG897733 |
| Celtic Name: | Eilean Ruairidh Mòr |
| Meaning Of Name: | Island of Big Rory/Roderick |
| Area: | 38 ha[1] |
| Area Rank: | (Freshwater: 10) |
| Highest Elevation: | 51 m |
| Population: | 0 |
| Island Group: | Loch Maree |
| Local Authority: | Highland |
| References: | [2] |
Eilean Ruairidh Mòr is a forested island in Loch Maree, Wester Ross, Scotland. Its name was formerly anglicised as "Ellan-Rorymore".[3]
The island is owned by Forestry and Land Scotland, as is the Slattadale Forest on the southern shore of Loch Maree.[4] The islands in Loch Maree are among the least disturbed in Britain and are managed as a national nature reserve.[5]
Eilean Ruairidh Mòr was planted with pines in about 1815. There are remains of a subterranean circular structure,[3] similar to a Scandinavian dùn or burgh. The ancestors of the Mackenzies of Gairloch held it as a place of security from the attacks of the Macleods.[6]