Loch Lomond Golf Club is located in Luss, Argyll & Bute, Scotland on the shore of Loch Lomond. The course occupies land previously held by Clan Colquhoun and includes the clan's seat of Rossdhu Mansion as its clubhouse.
While Clan Colquhoun had occupied the site of the present club since ancient times, the medieval Rossdhu Castle was constructed by Sir John Colquhoun in 1457 along with the private chapel of St. Mary of Rossdhu when his lands were consolidated into the free Barony of Luss.
Rossdhu is derived from the Scottish Gaelic ros dubh, meaning the "black headland". The castle was ruined in a fire after the construction of Rossdhu Mansion (ruins can be seen directly behind the course's 18th green).
The central portion of the present house, known as Rossdhu Mansion, was completed in 1773. The grand Georgian manor house was constructed by Sir James Colquhoun and was likely designed by well-known architect John Baxter to replace the 15th-century castle, though no documentation survives. This was the family seat when Sir James Colquhoun, 3rd Baronet led the clan and the writer Janet Colquhoun was his wife.
Until the late 1970s, the house was home to Sir Ivar Colquhoun, 8th Baronet and Lady Colquhoun. They loaned many original pieces of furniture and artwork to the restored manor house in 1994, thus assuring that Rossdhu Mansion would be historically preserved notwithstanding ownership by the Club.
