Alexander George Thynn, 7th Marquess of Bath (born 6 May 1932), styled Viscount Weymouth between 1946 and 1992, is an English politician, artist and author. He was born with the surname Thynne but adopted the spelling Thynn in 1976. He is ranked 359th in the Sunday Times Rich List 2009, with an estimated wealth of £157 million. He has written several novels.