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.
Randolph and Philippa had the following children:
| Honorary titles | ||
|---|---|---|
| Preceded by Robert Francis Dudgeon |
Lord Lieutenant of Kirkcudbright 1932–1975 |
Succeeded by Gordon Guthrie Malcolm Bachelor |
| Masonic offices | ||
| Preceded by John Christie Stewart |
Grand Master of the Grand Lodge of Scotland 1945–1949 |
Succeeded by Charles Barclay-Harvey |
| Peerage of Scotland | ||
| Preceded by Randolph Stewart |
Earl of Galloway 1920–1978 |
Succeeded by Randolph Stewart |