Am Buachaille

Am Buachaille is a sea stack, or vertical rock formation composed of Torridonian Sandstone, 1 mi southwest of Sandwood Bay in the Scottish county of Sutherland. It lies at the tip of the Rubh' a Bhuachaille headland around 5 mi north of Kinlochbervie.

The stack is 65 m high and was first climbed in 1968 by the mountaineers Tom Patey, Ian Clough and John Cleare. At least four climbing routes are identified on Am Buachaille which is considered a "famous" sea stack climb and has been called the "most serious of 'the big three' Scottish stacks" and a "truly great stack". The easiest route is graded Hard Very Severe (HVS) and access to the stack involves a 30 m swim at low tide.

The name means "the herdsman" or "the shepherd" in Scottish Gaelic.