Merlin Charles Sainthill Hanbury-Tracy, 7th Baron Sudeley, was a British hereditary peer, author, and monarchist. In 1941, at the age of two, he succeeded his first cousin once removed, Richard Hanbury-Tracy, 6th Baron Sudeley, to the Barony of Sudeley and until the reforms of House of Lords Act 1999, he regularly sat as a hereditary peer.

Baron Sudeley is a hereditary title that has been created three times in the history of Britain, twice in the Peerage of England and once in the Peerage of the United Kingdom. The first creation came in the Peerage of England in 1299 when John de Sudeley was summoned to Parliament as Lord Sudeley. On the death of the third Baron in 1367 the title fell into abeyance. The abeyance was terminated in 1380 when Thomas Boteler, the fourth Baron, became the sole heir. The sixth Baron was created Baron Sudeley by letters patent in 1441. He served as Lord High Treasurer from 1444 to 1447. On his death in 1473, the 1441 creation became extinct while the 1299 creation once again fell into abeyance.