Percy Hamilton Seymour, 18th Duke of Somerset (27 September 1910 – 15 November 1984), styled Lord Seymour between 1931 and 1954, of Bradley House in the parish of Maiden Bradley, Wiltshire, was a British peer.
In London on 18 December 1951, he married Gwendoline Collette Jane Thomas (d. 18 February 2005, aged 91), daughter of Major John Cyril Collette Thomas, of Burn Cottage, Bude, Cornwall, by whom he had three children:[1]
Lady Anne Frances Mary Seymour (b. 1954), unmarried and without issue.[1]
Lord Francis Charles Edward Seymour (b. 1956), who married Paddy Poynder, daughter of Colonel Anthony John Irvine Tony Poynder, MC, Corps of Royal Engineers, in 1982.[1]
The 18th Duke died on 15 November 1984 at Warminster, Wiltshire and was succeeded in his titles by his elder son, John.[2]