Randolph Algernon Ronald Stewart, 12th Earl of Galloway (21 November 1892 – 13 June 1978) was the son of Randolph Stewart, 11th Earl of Galloway, styled Viscount Garlies from 1901 to 1920.
On 14 October 1924, he married Philippa Fendall Wendell (died 22 February 1974). Philippa was the daughter of Jacob Wendell III (ca. 1869–1911) and Marian Fendall (1870). Marian was in turn the granddaughter of Philip Richard Fendall II (1794–1867), the District Attorney of the District of Columbia. Philippa was the sister of Anne Catherine Tredick Wendell, wife of Henry Herbert, 6th Earl of Carnarvon.
Randolph and Philippa had the following children: