Colonel James Archibald Stuart, later Stuart-Wortley-Mackenzie (19 September 1747 – 1 March 1818), British politician and soldier, was the second son of John Stuart, 3rd Earl of Bute and his wife Mary Stuart, Countess of Bute. On 8 June 1767 he married Margaret Cunynghame, daughter of , and they had five children: Upon the death of his mother, in 1794, he inherited the properties of the Wortley family, and assumed that surname on 17 January 1795. In 1800, he added the additional surname of Mackenzie, having succeeded to the estates of his uncle James Stuart Mackenzie.