Arthur Henry Johnstone-Douglas JP DL (23 June 1846 – 26 March 1923) was a Scottish soldier and politician.
He was the son of Robert Johnstone-Douglas of Lockerbie (1814–1866) and Lady Jane Margaret Mary Douglas (d. 1881), who were first cousins.
[4] After residing at Comlongon Castle,[5] he succeeded to Lockerbie House, a mansion in Dryfesdale, in Dumfriesshire, Scotland, in 1866 (upon the death of his father), together with 2336 acres, valued at £3345 per annum.
[10] Jane's eldest sister, Mary Stewart, was the wife of Sir William Baillie, 2nd Baronet.
[9] They lived at Lockerbie House and were the parents of:[6] Johnstone-Douglas died on 26 March 1923, at age 76, and was buried in Dryfebridge cemetery.