Suilven () is a mountain in Scotland. Lying in a remote area in the west of Sutherland, it rises from a wilderness landscape of moorland, bogs, and lochans known as Inverpolly National Nature Reserve. Suilven forms a steep-sided ridge some 2 km in length. The highest point, Caisteal Liath (Grey Castle in Scottish Gaelic), lies at the northwest end of this ridge. There are two other summits: Meall Meadhonach (Middle Round Hill) at the central point of the ridge is 723 m high, whilst Meall Beag (Little Round Hill) lies at the southeastern end.