Duchess of Somerset

The title Duchess of Somerset, held by the wives of the Dukes of Somerset, may refer to:

• Anne Seymour, Duchess of Somerset (fl. 1512–1587), second wife of Edward Seymour, 1st Duke of Somerset
• Frances Seymour, Duchess of Somerset (1599–1674), second wife of William Seymour, 2nd Duke of Somerset
• Sarah Seymour, Duchess of Somerset (1631–1692), wife of John Seymour, 4th Duke of Somerset
• Elizabeth Seymour, Duchess of Somerset (1667–1722), first wife of Charles Seymour, 6th Duke of Somerset
• Charlotte Seymour, Duchess of Somerset (c. 1693 – 1773), second wife of Charles Seymour, 6th Duke of Somerset
• Frances Seymour, Duchess of Somerset (1699–1754), wife of Algernon Seymour, 7th Duke of Somerset
• Mary Seymour, Duchess of Somerset (1697–1768), wife of Edward Seymour, 8th Duke of Somerset
• Anne Seymour, Duchess of Somerset (fl. 1769–1802), wife of Webb Seymour, 10th Duke of Somerset
• Charlotte Seymour, Duchess of Somerset (1772–1827), first wife of Edward St Maur, 11th Duke of Somerset
• Margaret Seymour, Duchess of Somerset (1805–1880), second wife of Edward St Maur, 11th Duke of Somerset
• Georgiana Seymour, Duchess of Somerset (1809–1884), wife of Edward St Maur, 12th Duke of Somerset
• Horatia Seymour, Duchess of Somerset (1819–1915), wife of Algernon St Maur, 14th Duke of Somerset
• Susan St Maur, Duchess of Somerset (1853–1936), wife of Algernon St Maur, 15th Duke of Somerset
• Rowena Seymour, Duchess of Somerset (1861–1950), wife of Edward Seymour, 16th Duke of Somerset
• Edith Seymour, Duchess of Somerset (fl. 1906–1962), wife of Evelyn Seymour, 17th Duke of Somerset
• Jane Seymour, Duchess of Somerset (1913–2005), wife of Percy Seymour, 18th Duke of Somerset
• Judith-Rose Seymour, Duchess of Somerset, wife of John Seymour, 19th Duke of Somerset