John Stewart, 7th Earl of Galloway KT (13 March 1736 – 13 November 1806) was a Scottish peer, styled Viscount Garlies from 1747 until 1773. He succeeded his father Alexander in 1773. He was elected one of the representative peers, representing the Peerage of Scotland in the House of Lords, in 1774 and sat there until the 1790s. From 1783 until his death he was a Lord of the Bedchamber to King George III.
The Earl, a Tory, was the target of two hostile poems by Robert Burns, John Bushby's Lamentation and On the Earl of Galloway.
Galloway, a frequent opera-goer, was caricatured by James Gillray in An Old Encore at the Opera! of 1803. In 1762 James Boswell wrote of him that he had "a petulant forwardness that cannot fail to disgust people of sense and delicacy".
On 14 August 1762, he married Lady Charlotte Greville (died 1763), the daughter of Francis Greville, 1st Earl of Warwick. They had two sons, both of whom died in infancy. After Charlotte's death, he married Anne Dashwood, daughter of Sir James Dashwood, 2nd Baronet, on 13 June 1764. They had sixteen children:
Lady Catherine Stewart (18 March 1765 – 20 September 1836), married Sir James Graham, 1st Baronet in 1781
Hon. Alexander Stewart (18 February 1766 – 29 March 1766)
Lady Susan Stewart (10 April 1767 – 2 April 1841), married George Spencer-Churchill, 5th Duke of Marlborough in 1791
Adm. George Stewart, 8th Earl of Galloway (1768–1834)
Lady Anne Harriet Stewart (2 November 1769 – 30 January 1850), married Lord Spencer Chichester in 1795
Lady Elizabeth Euphemia Stewart (6 October 1771 – 12 November 1855), married William Philips Inge in 1798
Hon. Leveson Keith Stewart (4 October 1772 – 12 September 1780)
Lady Georgiana Frances Stewart (15 May 1776 – 12 April 1804)
Lt.-Gen. Hon. Sir William Stewart (1774–1827)
Rt. Rev. Hon. Charles James Stewart (15 April 1775 – 13 July 1837), Bishop of Quebec
Lady Charlotte Stewart (7 August 1777 – May 1842), married Sir Edward Crofton, 3rd Baronet in 1801
Lady Caroline Stewart (23 October 1778 – 1818), married Rev. Hon. George Rushout-Bowles in 1803; mother of George Rushout, 3rd Baron Northwick
Hon. Montgomery Granville John Stewart (1780–1860)
Hon. Edward Richard Stewart (1782–1851)
Lt.-Col. James Henry Keith Stewart (1783–1836)
Lady Georgiana Charlotte Sophia Stewart (1 February 1785 – 25 July 1809), married Col. Hon. William Bligh {1775-6 August 1845} in 1806; {Bligh was the a son of John Bligh, 3rd Earl of Darnley}; had issue of one daughter Sophia married to Henry William Parnell {1809-1896} in 1835 {His father Henry Parnell, 1st Baron Congleton was a Great uncle of Charles Stewart Parnell. A sister Emma Jane Parnell was married to Edward Bligh, 5th Earl of Darnley}. Sophia and Henry marriage had issue of four sons and one daughter.