Marquess of Bath is a title in the Peerage of Great Britain. It was created in 1789 for Thomas Thynne, Viscount Weymouth. The Marquess holds the subsidiary titles Baron Thynne, of Warminster in the County of Wiltshire, and Viscount Weymouth, both created in 1682 in the Peerage of England. He is also a baronet in the Baronetage of England.