Sir Alasdair Duncan Atholl MacGregor KC (4 June 1883 – 30 October 1945) was a British lawyer and judge.

However, official announcements, such as his appointments and honours published in the London Gazette, refer to him, as would be expected, by his full name of Alasdair Duncan Atholl MacGregor.

[2] Atholl attended the University of Edinburgh, where he graduated with an MA, followed by Lincoln College, Oxford, where he obtained a BA.

[4] He married, in 1919, Gertrude Mary, the youngest daughter of Mr R. Brandon Tasker of Marino, Caernarfon in North Wales.

As Chief Justice he was reported to "have won golden opinions on the bench where he has displayed abilities of a high order, whilst socially also he has shown himself to be a man of marked charm of personality.

[11] He was made a Commander of the Grand Priory in the British Realm of the Venerable Order of the Hospital of St John of Jerusalem in 1940.