Sir Thomas Thynne (c.1578–1639), of Longleat, Wiltshire, was an English landowner and politician who sat in the House of Commons at various times between 1601 and 1629. His romance with the daughter of his family's enemies may have inspired Shakespeare to pen Romeo and Juliet.

Thomas Thynne, 1st Viscount Weymouth was a British peer in the peerage of England.