Alexander Fraser, Lord Strichen (1700–1775) was a Scottish judge and Senator of the College of Justice.

He was born at Strichen Castle in Aberdeenshire the eldest son of Alexander Strichen (1660-1699), 5th Laird of Strichen. His father died shortly before his birth. His mother died when he was eleven.^{[citation needed]} Strichen Castle had been the family home since its construction in the 16th century.^[1]

He studied law and passed the bar as an advocate around 1722. On 15 June 1729 he was created a Senator of the College of Justice (at age 29 one of the youngest Senators ever) in place of the late Andrew Hume, Lord Kimmerghame.^[2]

His house in Edinburgh stood on the Royal Mile on Rosehaugh's Close (later called Strichens Close in his honour).^[3]

He died on 15 January 1775 at his country estate of Strichen.^[4]

His position as Senator was filled by Alexander Lockhart, Lord Covington.^[5]

He married Lady Lydia Ann Campbell (1692-1736) daughter of Archibald Campbell, 1st Duke of Argyll and widow of James Stuart, 2nd Earl of Bute.^{[citation needed]}

Through this marriage he became stepfather to John Stuart, 3rd Earl of Bute, who later served as Prime Minister of Great Britain.^{[citation needed]}