Lieutenant-Colonel William Anstruther-Gray, FSA, JP, DL (6 September 1859 – 17 April 1938) was a Scottish soldier and politician.

The son of Colonel John Anstruther-Thomson of Charleton, Colinsburgh, Fife, and Maria Hamilton Gray of Carntyne, Glasgow, he was educated at Eton.

He was Aide-de-Camp to the Earl of Kintore, Governor of South Australia, from 1889 to 1891, was promoted to captain on 30 December 1893, and to major on 1 May 1897.

[1] He served in South Africa from 1901 to 1902 where he was commandant of the district of Knysna in 1901, and Inspector of Concentration Camps in Transvaal in 1902.

Following the end of the war in June 1902, he returned to the United Kingdom in the SS Dunottar Castle, which arrived at Southampton in July 1902.