William Fraser, 12th Lord Saltoun (21 November 1654 – 18 March 1715), was a Scottish peer and the 11th Laird of Philorth.
His political colours were shown when on 15 November 1706 he supported the Earl Marischal's protest against any future link with England.
The protest emphasised the view that with the death of an heirless Queen Anne, "no person can be designed a successor to the Crown of this realm".
In correspondence to his ally the Earl of Erroll, Fraser told of his belief that Hamilton was on the pay of the English Crown and doubted his real intentions.
Given Hamilton's weak leadership and the benefits he reaped from the Union, historians take real note of Fraser's observation when his contemporaries did not.
She was the daughter of James Sharp, the Archbishop of St Andrews who was murdered by Scottish Covenanters on Magnus Muir in 1679.