The title Baron Seymour of Trowbridge was created in the Peerage of England on 19 February 1641 for Francis Seymour, a younger son of Edward Seymour, Lord Beauchamp, for his support of Charles I in Parliament. It became a subsidiary title of the Duke of Somerset in 1675, and became extinct on the death of Algernon Seymour, 7th Duke of Somerset in 1750.
For further holders, see Duke of Somerset until 1750.